Answer:
Oxidation State of H in H₂SO₄ = +1
Oxidation State of S in H₂SO₄ = +6
Oxidation State of O in H₂SO₄ = -2
Explanation:
Oxidation number:
oxidation number is an apparent charge of an atom in a compound.
the total charge on a compound is zero
So for H₂SO₄ total charge = 0
Hydrogen donate an electron in H₂SO₄ and have +1 charge that is oxidation number
***so to calculate oxidation number of Sulfur and Oxygen in H₂SO₄
oxygen have 2- state
O.N. of H = 1+
O.N. of O = 2-
O.N. of S = x
H₂SO₄ =0
put values
(+1)2 + S + (-2)4=0
+2 + S -8 =0
S = 0-2 + 8
S = +6
****Now to find oxidation number of Oxygen
O.N. of H = 1+
O.N. of O = x
O.N. of S = +6
H₂SO₄ =0
put values
(+1)2 + (+6) + (O)4=0
+2 + 6 - (O) 4 =0
(O)4 = 0-2 - 8
(O)4 = -8
O = -8/4
O = -2
***Now to find oxidation number of Oxygen
O.N. of H = 1+
O.N. of O = x
O.N. of S = +6
H₂SO₄ =0
put values
(H)2 + (+6) + (-2)4=0
(H)2 + 6 - 8 =0
(H)2 = 0 - 6 + 8
(H)2 = +2
H = +2/2
H = +1
the values are given in the table below
Substance ΔH°f (kJ/mol)
SO2 (g) −297
SO3 (g) −396
SO2Cl2 (g) −364
H2SO4 (ℓ) −814
H2O (ℓ) −286
The value of ΔH° for the following reaction is −62.1 kJ. What is the value of ΔH°f for HCl(g)?
SO2Cl2(g) + 2 H2O(ℓ)→ H2SO4(ℓ) + 2 HCl(g)
The enthalpy change for the given reaction is -62.1 kJ. By applying Hess's Law, we can calculate the enthalpy of formation (ΔH°f) for HCl(g). Using the given enthalpy values, we find that ΔH°f for HCl(g) is -62 kJ/mol.
Explanation:The reaction given is:
SO2Cl2(g) + 2 H2O(ℓ) → H2SO4(ℓ) + 2 HCl(g)
We know that the enthalpy change, ΔH°, for the reaction is -62.1 kJ. We can use the given enthalpy of formation (ΔH°f) values to calculate the enthalpy of formation of HCl(g).
Calculate the enthalpy change for the formation of H2SO4(ℓ) from its elements (ΔH°f H2SO4(ℓ)). Calculate the enthalpy change for the formation of SO2Cl2(g) from its elements (ΔH°f SO2Cl2(g)). Calculate the enthalpy change for the formation of HCl(g) from its elements (ΔH°f HCl(g)).
By applying the Hess's Law, we can determine the enthalpy changes based on the given data.
ΔH°f HCl(g) = ΔH°f SO2Cl2(g) + ΔH°f H2SO4(ℓ) - 2ΔH°f H2O(ℓ)
Substituting the given values, we have: ΔH°f HCl(g) = -364 kJ/mol + (-814 kJ/mol) - 2(-286 kJ/mol) = -62 kJ/mol
Therefore, the value of ΔH°f for HCl(g) is -62 kJ/mol.
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The heat of formation, or ΔH°f, for hydrogen chloride (HCl(g)) is −92.3 kJ/mol. This was found using Hess's Law and the given standard heats of formation.
Explanation:The question is asking us to determine the heat of formation, or ΔH°f, for hydrogen chloride (HCl(g)) using the provided standard heats of formation and the heat of the reaction. This falls under the topic of thermodynamics in chemistry.
According to Hess's Law, the total enthalpy change for a reaction is the sum of the enthalpy changes for each step, regardless of the number of steps. So, the ΔH° for the reaction is the sum of the heats of formation of the products minus the sum of the heats of formation of the reactants. Mathematically, that's ΔH° = [ΔH°f(H2SO4) + 2*ΔH°f(HCl)] - [ΔH°f(SO2Cl2) + 2*ΔH°f(H2O)].
The only unknown in this equation is ΔH°f(HCl), which we can solve for:
ΔH°f(HCl) = {[ΔH° + ΔH°f(SO2Cl2) + 2*ΔH°f(H2O)] - ΔH°f(H2SO4)} / 2. Substituting the given values into this equation gives ΔH°f(HCl) = {-62.1 kJ + (-364 kJ) + 2*(-286 kJ) - (-814 kJ)} / 2 = −92.3 kJ/mol. So, the heat of formation for HCl(g) is −92.3 kJ/mol.
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A speaker conntected to an MP3 player converts electrical energy into sound energy.according to the law of conversation of energy energy is? A)distroyed when operating b)created when operating c) neither created nor distroyed when operating d) created and then distroyed as the system operate
Answer:
c
Explanation:
The law of conservation clearly states that energy can neither be created nor destroyed
15. Which is not a zone in the three-layered structure of the ocean relating to density?
īptive)
O surface mixed zone
O intertidal zone
O deep zone
O transition zone
The intertidal zone is not a zone in the three-layered structure of the ocean relating to density. Therefore, option B is correct.
What is the intertidal zone ?The intertidal zone is the area between high and low tides where the ocean meets the land. The Monterey Bay National Marine Sanctuary's tide pool.
Intertidal zones can be found anywhere the ocean meets the land, ranging from steep, rocky ledges to long, sloping sandy beaches and mudflats that can stretch for hundreds of meters.
Population density is often measured in three different ways. There is arithmetic density, physiological density, and agricultural density.The intertidal zone is the area where the ocean and land meet. It is not a zone in the ocean's three-layered structure.
Thus, option B is correct.
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8.
A student performing an investigation of chemical reactions mixes two aqueous solutions and observes
a change in color. Color change is most indicative of which type of chemical reaction?
A Neutralization
B Precipitation
c Oxidation-reduction
D Acid-base
Color change is most indicative of acid-base type of chemical reaction.
What is chemical reaction?
Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and reactions are accompanied by an energy change as new substances are formed.
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Practice 14
The mass of a proton is approximately
1) 1/2000 times the mass of a neutron and a unit positive charge
2) 1/2000 times the mass of a neutron and a unit negative charge
3) 2000 times the mass of an electron and a unit positive charge
4) 2000 times the mass of an electron and a unit negative charge
Answer:
3) 2000 times the mass of an electron and a unit positive charge
Explanation:
The proton is approximately 2000 times massive than electron.
Neutron and proton are present inside the nucleus. Proton has positive charge while neutron is electrically neutral. Proton is discovered by Rutherford while neutron is discovered by James Chadwick in 1932.
Symbol of proton= P+
Symbol of neutron= n0
Mass of proton=1.672623×10-27 Kg
Mass of neutron=1.674929×10-27 Kg
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.
Symbol= e-
Mass= 9.10938356×10-31 Kg
It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties.
The area of the circular base of a can of
dog food is 12.5 in. The can is 6 inches
high. What is its volume?
The volume of the can of dog food is approximately 74.8 cubic inches.
To calculate the volume of the can of dog food, we use the formula for the volume of a cylinder, which is V = (pi x [tex]r^2[/tex] x h), where V is the volume, pi is approximately 3.14159, r is the radius of the base, and h is the height of the cylinder.
First, we need to find the radius of the base. We know the area (A) of the circular base is 12.5 in2, and the area of a circle is given by A = pi x [tex]r^2[/tex]. We can solve for r:
A = pi x [tex]r^2[/tex]
12.5 = 3.14159 x [tex]r^2[/tex]
[tex]r^2[/tex] = 12.5 / 3.14159
[tex]r^2[/tex] = 3.981
r = [tex]\sqrt{3.981}[/tex]
r = 1.994 inches approximately.
Now that we have the radius, we can calculate the volume of the can:
V = pi x [tex]r^2[/tex] x h
V = 3.14159 x [tex](1.994 in)^2[/tex] x 6 in
V = 74.8 in3 (rounded to one decimal place).
Thus, the volume of the can of dog food is approximately 74.8 cubic inches.
determine the mass in grams of 7.20 mol of antimony(molar mass =121.76g
Answer:
876.672 g
Explanation:
Data given:
moles of antimony (Sb) =7.20 mol
Molar mass of Sb= 121.76 g
Mass in grams of Sb
Formula to be used
no. of moles = mass in grams / molar mass
For antimony (Sb) we can write as
no. of moles of Sb = mass in grams of Sb / molar mass of Sb
Rearrange above equation
mass in grams of Sb = no. of moles of Sb x molar mass of Sb . . . . . . .(1)
Put values in above formula (1)
mass in grams of Sb = 7.20 mol x 121.76 g/mol
mass in grams of Sb = 876.672 g
Final answer:
The mass of 7.20 mol of antimony, given its molar mass of 121.76 g/mol, is calculated to be 876.672 grams by multiplying the number of moles by the molar mass.
Explanation:
To determine the mass in grams of 7.20 mol of antimony, with a molar mass of 121.76 g/mol, you use the formula mass = moles × molar mass. Therefore, the calculation should be as follows:
Mass of antimony = 7.20 mol × 121.76 g/mol = 876.672 g
This calculation shows that 7.20 moles of antimony has a mass of 876.672 grams. To solve such problems, always ensure to multiply the number of moles given by the substance's molar mass, which in this case is derived from the periodic table for antimony (Sb).
zinc carbonate and perchloric acid. complete and balance the following reactions
Answer:
ZnCO3 + 2HClO4 = Zn(ClO4)2 + CO2 + H2O
Explanation:
ZnCO3 + 2HClO4 = Zn(ClO4)2 + H2CO3
ZnCO3 + 2HClO4 = Zn(ClO4)2 + CO2 + H2O
Final answer:
Zinc metal reacts with hydrochloric acid to produce zinc chloride and hydrogen gas, represented by the balanced equation Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g).
Explanation:
The reaction between zinc metal and hydrochloric acid (HCl) is a single-displacement reaction that produces zinc chloride (ZnCl2) and hydrogen gas (H2). The balanced chemical equation for this reaction is:
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
This reaction is an example of the combination of stoichiometry and the ideal gas laws that can occur in chemical reactions.
A polar covalent bond is likely to form between two atoms that
a. are similar in electronegativity
b. are of similar size
c. differ in electronegativity
Answer:
c. differ in electronegativity
Explanation:
Covalent bond:
It is formed by the sharing of electron pair between bonded atoms.
The atom with larger electronegativity attract the electron pair more towards it self and becomes partial negative while the other atom becomes partial positive.
For example:
In water the electronegativity of oxygen is 3.44 and hydrogen is 2.2. That's why electron pair attracted more towards oxygen, thus oxygen becomes partial negative and hydrogen becomes partial positive . The bond is polar.
When the elctronegativity difference is 0.4 or less than 0.4 the bond is non polar.
if the electronegativity difference is greater than 0.4 the bond is polar.
A polar covalent bond is likely to form between two atoms that differ in electronegativity, resulting in an unequal sharing of electrons and a molecule with a partial negative and positive charge.
Explanation:A polar covalent bond is likely to form between two atoms that c. differ in electronegativity. This is because, in a polar covalent bond, one atom has a greater attraction for the electrons than the other atom. If the relative attraction, or electronegativity, of an atom for electrons is significant enough to create an unequal sharing of electrons, the result is a polar covalent bond with one end of the bond having a slight negative charge and the other end having a slight positive charge.
For example, in a water molecule, the oxygen atom is more electronegative than the hydrogen atoms, resulting in a polar covalent bond where the shared electrons spend more time closer to the oxygen nucleus, giving it a slightly negative charge and leaving the hydrogen atoms with a slightly positive charge.
Gases fill up any available space as they don't have a definite shape.
a. True
b. False
Answer:
Particles are far apart from each other because there are very weak forces of attraction between them. They move fast in all directions. Because of this, gases don't have a definite shape or volume and fill any container. Because there is lots of free space between particles, gases can easily be compressed.
Explanation:
How many molecules of substance B are produced when
29.3g of substance A reacts? The molar mass of substance A is
19.2g/mol.Convert the mass of A to moles.
moles of A:
Step 2: Convert the number of moles of A to the number of moles of B.
moles of B:
Step 3: Convert the number of moles of B to molecules of B.
Final Answer:
Approximately [tex]\(9.18 \times 10^{23}\)[/tex]molecules of substance B are produced when 29.3g of substance A reacts.
Explanation:
To determine the number of molecules of substance B produced when 29.3g of substance A reacts, we follow these steps:
Step 1: Convert the mass of A to moles.
Given mass of A = 29.3g
Molar mass of A = 19.2g/mol
Number of moles of A = [tex]\( \frac{{\text{{Given mass}}}}{{\text{{Molar mass}}}} \)[/tex]
[tex]\[ \text{{Moles of A}} = \frac{{29.3 \, \text{{g}}}}{{19.2 \, \text{{g/mol}}}} \][/tex]
[tex]\[ \text{{Moles of A}} \approx 1.526 \, \text{{mol}} \][/tex]
Step 2: Convert the number of moles of A to the number of moles of B.
Given chemical reaction (assuming a 1:1 ratio for simplicity):
[tex]\[ \text{{A}} \rightarrow \text{{B}} \][/tex]
Since the ratio is 1:1, moles of A equals moles of B.
[tex]\[ \text{{Moles of B}} = \text{{Moles of A}} \][/tex]
[tex]\[ \text{{Moles of B}} \approx 1.526 \, \text{{mol}} \][/tex]
Step 3: Convert the number of moles of B to molecules of B.
Avogadro's number states that 1 mole of any substance contains [tex]\(6.022 \times 10^{23}\)[/tex] molecules.
[tex]\[ \text{{Molecules of B}} = \text{{Moles of B}} \times (6.022 \times 10^{23} \, \text{{molecules/mol}}) \][/tex]
[tex]\[ \text{{Molecules of B}} \approx 1.526 \times (6.022 \times 10^{23}) \][/tex]
[tex]\[ \text{{Molecules of B}} \approx 9.18 \times 10^{23} \, \text{{molecules}} \][/tex]
Therefore, approximately [tex]\(9.18 \times 10^{23}\)[/tex]molecules of substance B are produced when 29.3g of substance A reacts.
Which elements are part of the halogens group?
Hint Review your periodic table.
O potassium (K), chlorine (Ch. sulfur (5)
O bromine (Br), oxygen (O). nitrogen (N)
O neon (Ne) nitrogen (N), nickel (Ni)
O chlorine (CI), bromine (Br), fluorine (.
Answer:
chlorine (Cl), bromine (Br), fluorine (F)
Explanation:
as of writing this explanation, pokimane has been banned on twitch
If you place a___
charge into an electric field, it will move in the
direction indicated by the electric field lines.
Positive.............
Answer:
If you place a positive charge into an electric field, it will move in the direction indicated by the electric field lines.
Explanation:
The electric field is directed radially outward from a point charge in all directions. So when the charge is positive, the force it suffers will be parallel to, the electric field, and if it is negative the force will be opposite to the field.
A measurement has two parts a number and a
Answer:perimiter
Explanation:
What is the momentum
of an 800-kg car
| traveling at a velocity
of 10 m/s? What is its
momentum if it speeds
up to 50 m/s?
Answer:
P = 8000 Kg m/s
When speed is increased to 50 m/s,
P = 40,000 kg. m/s
Explanation:
Given data:
Mass = 800 Kg
Velocity = 10 m/s
Momentum = ?
Speed increased = 50 m/s
Momentum = ?
Solution:
Formula:
P = mv
P = 800 kg× 10 m/s
P = 8000 Kg m/s
When speed is increased to 50 m/s.
P = mv
P = 800 kg× 50 m/s
P = 40,000 kg. m/s
What is the living part of an ecosystem called?
Answer: biotic factors or biotic factors
Explanation:
What does adding a neutron to an atom's nucleus do to the atom's mass?
O
A. It adds 1 more unit of mass to the atomic weight of the atom.
B. A proton will be added with the neutron, increasing the weight by 2
mass units.
C. A neutron has no mass, so the atomic mass will remain
unchanged.
O
D. Adding a neutron is balanced by adding an electron, keeping the
mass the same.
Answer:
A :) It adds 1 more unit of mass to the atomic weight of the atom.
Explanation:
I just completed it on apex
Answer:
A
Explanation:
Mac Arthur Forrest process is used for the extraction of?
Gold cyanidation ( which is also known as the cyanide process or the MacArthur-Forrest process) is a hydro-metallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex. It is the most commonly used leaching process for gold extraction
The MacArthur Forrest process is used for the extraction of gold. It involves the use of a weak cyanide solution to dissolve the gold from its ore, which is then separated and refined to obtain pure gold.
Explanation:The MacArthur Forrest process is used for the extraction of gold.
This process, also known as the cyanide process or cyanidation, involves the use of a weak cyanide solution to dissolve the gold from its ore.
Here are the steps:
The crushed ore is mixed with water to create a slurry.Cyanide solution is added to the slurry, which helps to dissolve the gold.Zinc is then added to the slurry, which reacts with the gold and forms a solid precipitate.The precipitate, which contains the gold, is then separated from the rest of the slurry and undergoes further refining to obtain pure gold.Learn more about Extraction of gold here:https://brainly.com/question/7719613
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Which of the following is an example of a longitudinal wave
Answer:
D. Sound waves
Explanation:
The following options are missing:
A. radio wave
B. X-rays
C. Light waves
D. Sound waves
There are two kinds of waves: longitudinal and transverse.
In longitudinal waves, the vibrations are parallel to the direction of wave travel. Examples of longitudinal waves include: sound waves and ultrasound waves.
In transverse waves, the vibrations are at right angles to the direction of wave travel. All electromagnetic waves (e.g. light waves, microwaves, radio waves and X-rays) are transverse waves.
A longitudinal wave is a type of wave in which the disturbance or movement of the particles is parallel to the direction of the wave propagation. Sound waves and seismic P-waves are examples of longitudinal waves. In contrast to transverse waves where the disturbance is perpendicular to the direction of wave propagation.
Explanation:In physics, a common example of a longitudinal wave is a sound wave in air or water. In these waves, the periodic variations in pressure or disturbances are parallel to the direction of wave propagation. Other examples of longitudinal waves are seismic waves generated by earthquakes, specifically the compressional or P-waves, which move particles in the same direction as the wave itself.
In contrast, in transverse waves, such as those created on the strings of musical instruments, the disturbance or movement of the particles is perpendicular to the direction of wave propagation. It's important to note that some waves, like ocean waves and seismic waves, can consist of both transverse and longitudinal wave components.
To further clarify, consider a toy spring. If you create a disturbance by stretching and then compressing the spring in a horizontal direction, similar to how particles move in response to a sound wave, this represents a longitudinal wave.
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What mass in grams of fructose is contained in 325 mL of a 1.5 M fructose solution
87.75 g of fructose
Explanation:
molar concentration = number of moles / volume (L)
number of moles = molar concentration × volume
number of moles of fructose = 1.5 × 0.325
number of moles of fructose = 0.4875 moles
number of moles = mass / molar weight
mass = number of moles × molar weight
mass of fructose = 0.4875 × 180
mass of fructose = 87.75 g
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Which element has the largest atomic radius?
The answer is argon !
Explanation:
The answer is argon !
Which statements best describe the relationship between genes and alleles?
Question 5 options:
Alleles usually have two forms of genes and carry instructions for proteins that express traits. Genes are alternative forms of the instructions.
Genes carry instructions for proteins that express traits. Alleles are instructions for making carbohydrates.
Genes carry instructions for proteins that express traits. Alleles are instructions for making lipids.
Genes usually have two alleles and carry instructions for proteins that express traits. Alleles are alternative forms of the instructions.
The answer is D) "Genes usually have two alleles and carry instructions for proteins that express traits. Alleles are alternative forms of the instructions."
Hope this helped!
Explain the process of groundwater
weathering erosion and how it affects
Florida's limestone bedrock.
Answer:
Limestone is easily eroded from above and below.
Explanation:
The Florida bedrock is largely made of limestone. Because limestone is a rock that is easily eroded, the landscape of a great part of Florida is classified as karstic.
Karstic landscapes are dotted by sinkholes, underground rivers, caves, and springs. The more acidic the groundwater or rainwater, the faster and more easily the limestone will succumb to erosion.
In this way, underground rivers, streams, runoff, rain, and underground water pooled in caves have all carved out gaps and caverns in the weak limestone bedrock.
Groundwater weathering erosion chemically weathers limestone due to carbonic acid, leading to features such as caves, sinkholes, and Karst topography. This process is influential in Florida, affecting soil development, topography, and ecological systems.
Explanation:Groundwater Weathering Erosion and its Effects on Florida's Limestone BedrockGroundwater weathering erosion is a significant geologic process, particularly in areas with limestone bedrock, such as Florida. This process involves the chemical weathering of limestone primarily due to carbonic acid in groundwater. As rainwater permeates the ground, it combines with carbon dioxide to form carbonic acid. This mild acid can dissolve limestone, creating features such as caves, sinkholes, and Karst topography. Over time, water traveling along fractures and joints in the bedrock dissolves limestone, carrying it away and enlarging these openings. Eventually, massive underground voids can form which, when they collapse, lead to the formation of sinkholes on the surface. This process not only affects the physical landscape but also has implications for groundwater movement and ecology.
The physical disintegration and chemical decomposition of limestone not only shape the topography but also contribute to soil development. As limestone is weathered, the released minerals and altered rock particles mix with organic matter to form soil, with distinct horizons emerging over time. In Florida, this process is important for understanding the regional environment and guides in various land-use practices, such as cautious use of fertilizers to prevent groundwater contamination through sinkholes and other channels.
How many molecules are in each of the following compounds or elements?
3) 9.273 x 10^7 grams of chromium (III) bicarbonate
Answer:
0.241 × 10³⁰ molecules
Explanation:
Given data:
Mass of Cr(HCO₃)₃ = 9.273 × 10⁷ g
Number of molecules = ?
Solution:
Number of moles = 9.273 × 10⁷ g/ 235 g/mol
Number of moles = 0.04× 10⁷ mol
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
For 0.04× 10⁷ moles of Cr(HCO₃)₃:
0.04× 10⁷ moles × 6.022 × 10²³ molecules / 1 mol
0.241 × 10³⁰ molecules
Is heated water more or less dense than the melted snow And rainwater
Answer:
Heated water is more dense than melted snow because water as liquid is denser than ice. Ice floats on water, which means that it has less density than water. Heated water is warmer and more dense than melted ice.
Explanation:
Elias observed a sample in the classroom. The sample was a liquid at room temperature. He performed a conductivity test and found that it did not conduct electricity. Which classification would best fit the sample?
A) ionic
B) metal
C) nonmetal
D) salt
Answer:
C) nonmetal
Explanation:
Given;
The sample is in liquid state and do not conduct electricity.
We have given four types of classification.So for first,
A) Ionic
Ionic compounds are found in solid state at room temperature and it conducts electricity when dissolved in water. Hence the sample could not be ionic.
B)Metal
Metals are found in solid state at room temperature except mercury and it conducts electricity very well. Mercury also conducts electricity.So the sample is not a metal.
C)Nonmetal
Non metals are found in solid state except bromine which is in liquid state at room temperature and it does not conducts electricity.
Here the property of nonmetal matches with the sample, so the sample is a nonmetal and it could be Bromine.
D)Salt
Salt is an ionic compound found in solid state at room temperature and it conducts electricity when dissolved in water. Hence the sample could not be salt.
Answer:
C for k12
Explanation:
5.
A 120.0 g sample of Thallium-208 decays. How much of the sample will remain after 3 half lifest
15.0 g
Explanation:We are given;
Original sample of Thallium-208 as 120.0 g The number of half lives as 3We are required to calculate the remaining mass after three half lives
We are going to use the formula;N = N₀ × 0.5^n
where, N is the remaining mass, N₀ is the original mass and n is the number of half lives.
Therefore;
N = 120.0 g × 0.5^3
= 15.0 g
Thus, the remaining mass of Thallium-208 is 15.0 g
Alternatively;
Since after every half life the mass reduces by half of the original then we can half a chain showing the reduction after three half lives;120.0 g → 60.0 g (120 × 0.5) → 30.0 g (60 × 0.5) → 15.0 g (30 × 0.5)
Therefore, the remaining mass after three half lives is 15.0 gFor the Thallium-208 sample, after each half-life, the amount of the substance was reduced by half. After three half-lives, 15.0 g of the original 120.0g sample will remain.
Explanation:In the concept of radioactive decay, each half-life is the period of time it takes for half of a substance to decay. We can determine how much of a radioactive isotope is left after a certain number of half-lives, such as the time span of three half-lives in this case, by reducing the original amount by half for each half-life period.
Let's apply this principle to your question. You start with a 120.0 g sample of Thallium-208. After the first half-life, half of the sample will have decayed, leaving 60.0 g. After the second half-life another 50% decays, leaving 30.0 g. Lastly, after the third half-life, the amount remaining is halved again, hence we have 15.0 g of Thallium-208 remaining.
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What is the overall charge of an ion Pat has 12 protons 10 electrons and 14 neutrons
Answer:
The over all charge on atom will be +2.
Explanation:
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.
For example
X is the element having 12 protons 10 electrons and 14 neutrons.
The number of protons and electrons are not equal which means two electrons are lose by the given atom and it is present in the form of cation.
The over all charge on atom will be +2.
What is a triple bond?
O
A. Single bonds made by 1 atom to 3 other atoms within a molecule
O
B. A covalent bond between 2 atoms where each atom contributes 6
electrons
O
C. An ionic bond between 2 atoms where 3 electrons have been
transferred
O
D. A covalent bond between 2 atoms where each atom contributes 3
electrons
The covalent bond between 2 atoms where each atom contribute 3 electrons is called a triple bond. In a triple bond, two are pi bonds and one is a sigma bond.
What is covalent bond ?Covalent bonds are formed between two non-metals through sharing of electrons. Two electron deficient atoms shares their valence electrons each other to achieve octet and forms covalent bonds.
Covalent bonds can be single, double or triple bonds. Single bonds are sigma bonds. Double bonds are formed through one sigma bond and one pi bond formed through sideways overlapping.
In a single bond each atoms shares one electron. In double bond each atom shares two electrons and in triple bonds, 3 electrons are shared by each atom. Hence, option D is correct.
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How many particles of water are there in 14 moles?
How many moles of forks do you have if there are 1.4 x 1027 forks?
How many molecules are in 23 moles of oxygen?
How many atoms in 3.00 moles of water?
How many molecules of methane do you have in 0.99 moles of methane?
Answer:
Explanation:
Given data:
1) How many particles of water are there in 14 moles?
Answer:
84.308 × 10²³ particles
Explanation:
Given data:
Number of moles = 14 mol
Number of particles = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
One moles = 6.022 × 10²³ particles
14 mol × 6.022 × 10²³ particles / 1 mol
84.308 × 10²³ particles
2) How many moles of forks do you have if there are 1.4 x 1027 forks?
Answer:
0.23 × 10⁴ moles
Explanation:
Given data:
Moles of fork = ?
Number of moles of fork = 1.4 x 10²⁷forks
Solution:
one mole = 6.022 × 10²³ fork
1.4 x 10²⁷forks × 1 mol / 6.022 × 10²³ fork
0.23 × 10⁴ moles
3) How many molecules are in 23 moles of oxygen?
Answer:
138.506 × 10²³ molecules
Explanation:
Given data:
Number of moles = 23 moles
Number of molecules = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
one mole = 6.022 × 10²³ molecules
23 mol × 6.022 × 10²³ molecules / 1 mol
138.506 × 10²³ molecules
4) How many atoms in 3.00 moles of water?
Answer:
18.066 × 10²³ atoms
Explanation:
Given data:
Number of moles = 3.00 moles
Number of atoms = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
one mole of water = 6.022 × 10²³ atoms of water
3 mol × 6.022 × 10²³ atoms / 1 mol
18.066 × 10²³ atoms
5) How many molecules of methane do you have in 0.99 moles of methane?
Answer:
6 × 10²³ molecules
Explanation:
Given data:
Number of moles of methane = 0.99 moles
Number of molecules = ?
Solution
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
one mole of methane = 6.022 × 10²³molecules of methane
0.99 mol × 6.022 × 10²³ molecules / 1 mol
6 × 10²³ molecules