Answer:
The unknown base should be KOH whose molar mass is 56 g per mol (Answer)
Explanation:
Molarity = moles /(Volume in liters)
So,
Moles = Molarity [tex]\times[/tex] Volume
[tex]\\$=0.219 M \times 289 m L$\\\\$=0.219 \frac{m o l}{L} \times 0.289 L$\\\\$=0.063291 \mathrm{mol}$[/tex]
Molar mass = mass/moles
[tex]\\\\$=\frac{3.50 \mathrm{g}}{0.063291 \mathrm{mol}}=55.3 \mathrm{g}$ per mole[/tex]
The unknown base should be KOH whose molar mass is 56 g per mol (Answer)
13. How many valence electrons does an atom
with 5 electrons, 5 neutrons, and 5 protons
have in its ground state?
A. 5
B.
4.
C.
D.
3
2
Answer:
The answer to your question is: 3
Explanation:
If an atom has 5 electrons, 5 neutrons and 5 protons, it means that the element is Boron. Boron is situated in the third group A, that means that is has 3 elements in its outermost shell.
Also, if we do the electronic configuration:
1s² 2s²2p¹
If we count the number of electron in the second level of energy, the result will be: 2 in s and 1 in p = 3. Those are the valence electrons.
Science is a unique field of thought because it relies on _______ to describe the world. A Teachers and students B Observations and experimentation C Books and writings D Scientists and statements
Answer:
B) Observations and experimentation
Explanation:
this is the most suitable words to describe how is Science used in describing the world. we collect the knowledge in organized way and provide it with explanations and start to predict about the future world
ِAny Inventions are based on Science and no Inventions without Observations and experimentation
No one of us have went to a chemistry or a physics labs without using Observations and experimentation
Which two particles are found in the nucleus of an atom?
O neutrons and electrons
O protons and electrons
O protons and neutrons
O neutrons and atoms
c. protons and neutrons are the two particles found in the nucleus of an atom
What is a proton?A proton is a subatomic particle found in the nucleus of every atom
What are protons and neutrons?
Protons and neutrons are in the center of the atom, making up the nucleus. Electrons surround the nucleus. Protons have a positive charge. Electrons have a negative charge. The charge on the proton and electron are exactly the same size but opposite.
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Answer:
C
Explanation:
just took quiz
A chemist is doing research to find a better way to process natural gas after it is removed from the ground. Which branch of chemistry best describes this chemist's work?
A: organic chemistry
B: inorganic chemistry
C: biochemistry
D: physical chemistry
Answer:
The branch of chemistry that best describes the chemist´s work is organic chemestry
Explanation:
The chemist wants to improve the process for natural gas, a mix of organic compuond, mainly alcans.
A research to find the better way to process natural gas after it is removed from the ground is a work in organic chemistry.
What is organic chemistry?Organic chemistry deals with organic compounds, their properties, reactions, uses etc. The organic compounds are hydrocarbons and its derivatives contain carbon chains attached with hydrogen in the backbone.
Natural gases are hydrocarbons like methane, propane, butane etc. They comes under organic chemistry. All other compounds other than hydrocarbons and their derivatives are inorganic.
Hence, the research work on natural gas comes in organic chemistry thus, option A is correct.
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This word means that one event happens at the same time as another event
Answer:
Meanwhile
Explanation:
Think of a comic book, or a superhero show, you usually see the protagonist, or the hero, doing something like saving an innocent pedestrian, or helping a little old lady across a street, then the screen will flash and say 'meanwhile' which means while this was happening, this was also happening.
An example could be in The Wizard of Oz, when Dorothy is walking with her friends through The Haunted Forest, you see the Wicked Witch of the East, peering through her crystal ball, unto Dorothy. To summarize what was happening you could say,
'Meanwhile, as Dorothy and her friends walked through The Haunted Forest, The Wicked Witch watched their stroll.'
Really hopes this helps!
What evidence is there that electrons move around in definite pathways around the
nucleus?
What evidence is there that electrons m
Answer:
Absorption and emission spectra
Explanation:
This is occurs when an atom either absorbs or emits energy when bombarded by a source.
Neils Bohr predicted that electrons moves round in the atom in distinct orbitals according to their energy. An electron in its ground state can become excited if it gains sufficient energy which surpasses that of its ground state configuration. An atom can also move from higher energy levels to lower ones. During the descent, energy is given off in form of emission spectra.
Absorption occurs when electrons in an atom absorbs energy from incoming radiation and they re-radiate it in all directions. This is given off as a spectra and can be observed for such electron.
Final answer:
Quantum mechanics replaced the idea of electrons moving in fixed orbits with the concept of orbitals, where electrons have a high probability of being found. Evidence for this includes distinct atomic spectra and quantum numbers that match experimental data.
Explanation:
The question about the behavior of electrons around the nucleus is a fundamental concept in chemistry and physics. The early model by Niels Bohr suggested that electrons move in definite circular paths or orbits around the nucleus, akin to planets orbiting the sun. However, this model was succeeded by quantum mechanics, which describes electron behavior as a set of probabilities rather than definite paths.
Quantum mechanics introduced the concept of electron orbitals, which describe regions of space around the nucleus where there is a high probability of finding an electron. One piece of experimental evidence is the atomic spectra, which show distinct lines corresponding to electrons moving between energy levels in an atom. This indicates that electrons occupy specific energy states rather than moving randomly.
Another supporting evidence comes from quantum numbers, which describe the properties of electron orbitals and help explain the arrangement of electrons in atoms. These quantum numbers arise naturally from the equations of quantum mechanics and match a vast array of experimental data.
4
Nitric acid can be made using ammonia.
a) The first stage in the manufacture of nitric acid is to oxidise ammonia, NH,,
to nitrogen(II) oxide, NO. Balance the equation for the reaction.
........ NH, + ........ O, → ......... NO + ........ H,O
Answer:
4NH3 + 5 O2 → 4 NO + 6 H2O
Explanation:
The formula of ammonia is NH3. Oxidise means adding 02. This will result in Nitrogen(II)oxide which is NO, and H20.
On the left side we have 3xH and on the right side we have 2x H. To get the same amount we multiply the left side bij 2 and the right side by 3.
This gives us 2N on the left side, so we multiply NO by 2, to get the same amount of N.
This gives us 5x O at the right side, so to get the same amount we multiply O2 by 5/2 ( we already got 2x O).
This gives us 2NH3 + 5/2 O2 → 2NO + 3H20
We multiply by 2 to get rid of fractions, which will give us:
4NH3 + 5 O2 → 4NO + 6H20
Which solution below most likely shows a vivid color?
A.) potassium chloride
B.) nickel chloride
C.) hydrogen chloride
D.) lithium chloride
Lithium chloride solution most likely shows a vivid colour.
Answer: Option D
Explanation:
Flame test, an analytical strategy in chemistry to find certain elements, like metal ions, on the basis of characteristic emission spectrum of each element.
Because each element has a well-defined spectrum of linear emission, scientists can recognise it by the colour of the flame they produce.
For example, lithium and strontium red flame, nickel chloride appears as a brown or green solid, the potassium salt in the flame gives a characteristic purple colour, and hydrogen chloride as acid, a colourless gas. Colour's dense in the order as blue > red > green > yellow.
Which statements about Earth’s crust are true? Check all that apply. The crust includes soil, rock, and water. There are three different kinds of crust. The crust is thickest under the ocean. The ocean crust is made of young rocks. The ocean crust is denser than continental crust.
Answer:
Options (1), (4) and(5)
Explanation:
The earth's lithosphere is divided into two types of crust, that are commonly known as-
Continental crust- It has a thickness of about 35-40 km and is comprised of minerals such as silicates, alkali feldspar that is less dense in nature. Oceanic crust- It has a thickness of about 7-10 km and is comprised of denser minerals such as olivine, pyroxene, and potash feldspar.Both the type of crust are comprised of water, rock as well as soil. The rocks of oceanic crust are much younger than the continental crust because the oceanic crust is formed from the seafloor spreading where the new materials are added to the crust along the mid-oceanic ridge. The rocks at this boundary are the youngest. On the other hand, the continental crust is the oldest and is present from the time of the formation of the earth. The denser oceanic crust subducts below the lighter continental crust in a convergent plate boundary.
Thus, the correct answers are options (1), (4) and(5).
Answer:the answers are 1,4 and 5
Explanation:hope this helps
Boyle's Law represents the relationship of volume as pressure changes. The constants of Boyle's Law are:
pressure and number of molecules of gas
volume and temperature
pressure and temperature
temperature and number of molecules of gas
pressure and volume
Answer:
pressure and volume
Explanation:
Boyle's law states that the volume of a fixed mass of gas is inversely proportional to it's pressure at constant temperature.
Answer:
D. pressure and volume
Explanation:
Boyle’s law states that,
For a given amount of a gas, Pressure is inversely proportional to its volume at constant temperature
Thus the expression is
PV = constant (T and n are constant)
When there is a change in pressure and volume we make use of the expression
[tex]P_1 V_1=P_2 V_2[/tex] (T and n are constants)
Where [tex]P_1[/tex] and [tex]V_1[/tex] are the Initial pressure and volume and
[tex]P_2[/tex] and [tex]V_2[/tex] are the final pressure and volume
Inversely proportional means when one increases the other one decreases. That is as per Boyle’s law when Pressure increases the volume will decrease and vice versa.
Which has the greater EN:
Cl or Al?
Answer:
CL
because cleetus will rule the world
A nugget of gold with a mass of 521 g is added to 50.0mL of water.The water level rises to a volume of 77.0mL. What is the density of the gold?
Answer:
The question to your answer is:
Explanation:
Data
mass = 521 g
Water volume = 50.0 ml
Increase of water = 77 ml
Formula
density = mass / volume
First substract the final volume to the initial volume
Volume of gold = 77 - 50 = 27 ml
Now, use the formula
density = 521 / 27 ml = 19.3 g/ml
The density of the gold nugget is 19.3 g/mL.
To find the density of the gold, we need to calculate the volume of the gold nugget from the water displacement and then divide the mass of the gold by this volume. The volume of the gold nugget can be determined by calculating the difference in the water level before and after the gold was added. This value is 77.0 mL - 50.0 mL = 27.0 mL. Since the density (d) can be calculated using the formula d = mass/volume, we can substitute the given mass of 521 g and the calculated volume of 27.0 mL to find the density.
Using these values gives us: density = 521 g / 27.0 mL = 19.3 g/mL.
Therefore, the density of the gold is 19.3 g/mL, which is consistent with the known density of gold.
A car is traveling at a speed of 95 mi/h. If there are 0.62137 miles (mi) in a kilometer,
what is the speed of the car in m/s?
Answer:
42 m/s
Explanation:
To we convert units for speed we can use dimensional analysis. First thing we do is seperate the measurement into a fraction. After this we can multiply by 1km over 0.62137 miles. We do this so that the miles cancel out.
[tex]\frac{95mi}{h}[/tex] × [tex]\frac{1km}{0.62137mi}[/tex] = [tex]\frac{95km}{0.62137h}[/tex]
After this we can use a conversion factor and divide by 3.6.
[tex]\frac{95km}{0.62137h}[/tex] ÷ 3.6 = 42 m/s
Jeannie dropped a solid object into a beaker of water and observed it for five minutes. Based on her observations, she determined that only a physical change occurred.
Which of the following observations would indicate that only a physical change occurred after she added the object?
A.
The object broke apart and seemed to disappear when dropped into the glass of water.
B.
The object sank to the bottom when dropped into the glass of water.
C.
Bubbles formed around the object as it sank to the bottom of the water and did not resurface.
D.
The object floated on the top of the water when when dropped into the glass.
Answer:
A. The object broke apart and seemed to disappear when dropped into the glass of water.
Explanation:
In a physical change, the physical properties of the matter usually the state of the matter is altered. Most physical changes are usually reversible and does not lead to the production of new substances.
When the solid object was dropped into the water beaker and it dissolves by disappearing the solution, we have experienced a physical change. This is a dissolution reaction. If we heat the solution and water given off, we can recover back the dissolved solid object.
4. the number that indicates the number of protons in the atoms
Answer:electrons indicates to the no of protons because they are same in number.
Explanation:
In a value, any non-zero digit is considered a significant digit. (Zeroes may or may not be significant.) What is the minimum number of significant digits in 828,000,000
Answer:
The minimum number of significant digits in 828,000,000 is 3.
Explanation:
This is because there are 3 non-zero digits that are considered significant.
The minimum number of significant digits in 828,000,000 is three.
Significant digitsIn the given number, all non-zero digits (8, 2, and 8) are considered significant digits. The zeroes in this case are placeholders and do not contribute to the number's significant digits.
Therefore, the minimum number of significant digits in 828,000,000 is three, as it is determined by the count of non-zero digits in the number.
This explanation emphasizes the rules for identifying significant digits in a value, focusing on the actual non-zero digits that convey meaningful information.
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PLEASE HELP ASAP !!! How to balance equations with brackets? Like Pb(NO3)2? How many of each element is there?
Answer:
When you have those kind of compounds you have to multiply each element inside the bracket by the subscript outside the bracket. Here you have 1 Pb, 2 N and 6 O.
Explanation:
Answer:
Replace the formulas inside the parentheses with single letters
Explanation:
Here's an equation with lots of parentheses.
(NH₄)₃PO₄ + Pb(NO₃)₂ ⟶ NH₄NO₃ + Pb₃(PO₄)₂
It looks impossible to balance, doesn't it?
One way to balance the equation is to recognize that the polyatomic ions (the formulas inside the parentheses) stay together.
Then we can make some substitutions.
Let A = NH₄, X = PO₄, and Y = NO₃
Then the equation becomes
A₃X + PbY₂ ⟶ AY + Pb₃X₂
Here's how to balance it.
1. Start with the most complicated formula, Pb₃X₂, and put a 1 in front of it.
A₃X + PbY₂ ⟶ AY + 1Pb₃X₂
2. Balance Pb
We have fixed three atoms of Pb on the right, so we need three atoms of Pb on the left. Put a 3 in front of PbY₂.
A₃X + 3PbY₂ ⟶ AY + 1Pb₃X₂
3. Balance X
We have fixed two atoms of X on the right, so we need two atoms of X on the left. Put a 2 in front of A₃X.
2A₃X + 3PbY₂ ⟶ AY + 1Pb₃X₂
4. Balance A
We have fixed 6 atoms of A on the left, so we need 6 atoms of A on the right. Put a 6 in front of AY.
2A₃X + 3PbY₂ ⟶ 6AY + 1Pb₃X₂
Every formula has a coefficient, and the equation is now balanced.
Next, we replace the original formulas in the equation.
The balanced equation is
2(NH₄)₃PO₄ + 3Pb(NO₃)₂ ⟶ 6NH₄NO₃ + 1Pb₃(PO₄)₂
How many moles of Al(CN)3 are in 251 g of the compound?
Answer:
251 g of compound contain 2.39 moles.
Explanation:
Given data:
mass of compound Al(CN)3 = 251 g
moles = ?
Solution:
First of all we will calculate the molar mass of given compound.
molar mass of Al(CN)3 = 26.98 + (26 × 3)
molar mass of Al(CN)3 = 105 g/mol
Formula:
number of moles = mass/ molar mass
number of moles = 251 g / 105 g/mol
number of moles = 2.39 mole
The element _____ is not one of the four most common in your body. hydrogen nitrogen oxygen sodium
Answer:
Nitrogen
Explanation:
Answer:
Explanation:
#9 Sodium (Na) - 0.15% - Sodium is an important electrolyte. Like potassium, it is used for nerve signaling. Sodium is one of the electrolytes that helps regulate the amount of water in the body.
4. The daily output of energy from the sun is 7.80 x 1027 kcal. Convert this energy to
joules (J) & write the answer in scientific notation.
Answer:
The answer to your question is: 3.276 x 10³¹ Joules
Explanation:
Energy from the sun: 7.80 x 10²⁷ kcal
Look for the factor to convert units
Rule of three to convert units
1 cal ---------------------- 4.2 Joules
1000 cal --------------------- x
x = (1000 x 4.2) / 1 = 4200 Joules
1 kcal ---------------- 4200 Joules
7.8 x 10²⁷ kcal ------- x
x = (7.8 x 10²⁷ x 4200) / 1 = 3.276 x 10³¹ Joules
1) If the average atomic mass of hydrogen in nature is 1.0079, what does that tell you about the percent
composition of H-1 and H-2 in nature?
Answer:
The percent composition of Protium( H¹) in nature is 99.21%.
The percent composition of Deuterium (H² )in nature is 0.79%.
Explanation:
Atomic mass of protium is 1.
Atomic mass of deuterium is 2.
These are two isotopes of hydrogen that make the total abundance of hydrogen in nature while third isotope tritium is radio active and unstable its abundance is 0%.
First of all we will set the fraction for both isotopes H¹ and H²
X for the isotopes having mass 2 amu.
1-x for isotopes having mass 1 amu.
The average atomic mass of hydrogen is 1.0079.
we will use the following equation,
2x + 1 (1-x) = 1.0079
2x + 1 - 1x = 1.0079
2x- 1x = 1.0079 - 1
1x = 0.0079
x= 0.0079/1
x= 0.0079
Percent abundance of H².
0.007 × 100 = 0.79 %
0.79% is abundance of H² because we solve the fraction x.
now we will calculate the abundance of H¹.
(1-x)
1-0.0079 =0.9921
Percent abundance of H¹.
0.9921 × 100= 99.21 %
99.21% for H¹.
The average atomic mass of hydrogen is 1.0079, which suggests that the most common isotope is H-1, but there is also a smaller amount of H-2 in nature. The specific percent composition would require more information to determine.
Explanation:The average atomic mass of an element is the weighted average of the atomic masses of its naturally occurring isotopes. The fact that the average atomic mass of hydrogen is 1.0079 indicates that the most abundant isotope in nature is H-1 (hydrogen-1 or protium) which has an atomic mass close to 1. However, H-2 (hydrogen-2 or deuterium) is also present in nature, but in smaller amounts, as its atomic mass is close to 2. The slightly higher than 1 average atomic mass takes into account these two isotopes' presence and their relative abundances.
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The scientific name of a grizzly bear is Ursus arctos. Which part of the name is the genus? Which part of the name is the species?
Answer:
Ursus: genus
Arctos: Species
Explanation:
If you think of the way the chart flows from the most broad to the most specific: kingdom, phylum/division, class, order, family, genus, species, you see that genus name comes first then the species name.
What is the mass in grams of 16.3 mol of the element
nickel, Ni?
Answer:
The mass of 16.3 moles of nickel is 956. 647 g.
Explanation:
Given data:
moles of nickel = 16.3 mol
molar mass of nickel = 58.69 g/mol
mass in gram = ?
solution:
Formula:
number of moles = mass / molar mass
mass = number of moles × molar mass
mass = 16.3 mol × 58.69 g/mol
mass= 956. 647 g
To find the mass of 16.3 mol of nickel, multiply the number of moles by the molar mass of nickel, 58.693 g/mol, resulting in a mass of 956.9 grams.
Explanation:To find the mass in grams of 16.3 mol of the element nickel (Ni), you need to use the element's molar mass. As identified in the information provided, the molar mass of nickel is 58.693 g/mol. Applying this molar mass to the given number of moles (16.3 mol), you can calculate the mass as follows:
Mass = number of moles × molar mass
Mass = 16.3 mol × 58.693 g/mol
Mass = 956.8969 g
Therefore, the mass of 16.3 mol of nickel is 956.9 grams (rounded to one decimal place).
If the reaction produced 15.5 g CO2, how many grams of heptane were burned?
Answer:
5 g of heptane were burned.
Explanation:
Given data:
Mass of CO₂ produced = 15.5 g
Mass of heptane burned = ?
Solution:
Balance chemical equation:
C₇H₁₆ + 11O₂ →7CO₂ + 8H₂O
First of all we will calculate the moles of CO₂ produced.
Number of moles = mass / molar mass
Molar of CO₂ = 44 g/mol
Number of moles = 15.5 g / 44 g/mol
Number of moles = 0.3523 mol
Now we will compare the moles of CO₂ and C₇H₁₆ from balance chemical equation
CO₂ : C₇H₁₆
7 : 1
0.3523 : 1/7 × 0.3523 = 0.05 mol
Mass of C₇H₁₆:
Number of moles = mass / molar mass
Mass = number of moles × molar mass
Mass = 0.05 mol / 100 g/mol
Mass = 5 g
When solid magnesium burns, it reacts with oxygen in the air to form a powder called magnesium oxide. A chemist performed this reaction in a lab and found that the mass of the magnesium oxide was greater than the mass of the magnesium. What is the reason behind this increase in mass?
A. The increase in the mass of the magnesium oxide was due to oxygen atoms in the air.
B. The increase in the mass of the magnesium oxide happened because oxygen is heavier than magnesium.
C. The increase in the mass of the magnesium oxide happened because magnesium is heavier than oxygen.
D. The increase in the mass of the magnesium oxide was due to magnesium atoms in the air.
Answer:
A. The increase in the mass of the magnesium oxide was due to oxygen atoms in the air.
Explanation:
Burning occurs in the presence of oxygen. A chemical combination occurs between Mg and O in that the atom of magnesium attracts one another.
Mg + O₂ → MgO
Starting with the magnesium, on reacting with oxygen a new compound forms. This is why there is mass increase in the MgO compared to the starting material.
Answer: A. The increase in the mass of the magnesium oxide was due to oxygen atoms in the air.
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The balanced chemical equation for burning of magnesium in air is:
[tex]Mg(s)+O_2(g)\rightarrow 2MgO(s)[/tex]
When magnesium combines with oxygen, the mass of magnesium oxide formed will be same as the sum of masses of magnesium and oxygen.
Thus the increase in the mass of the magnesium oxide was due to oxygen atoms in the air.
Which orbitals form a pi bond?
Final answer:
A pi bond is formed by the side-by-side overlap of unhybridized 2pz orbitals on the carbon and the oxygen.
Explanation:
The pi bond is formed by the side-by-side overlap of unhybridized 2pz orbitals on the carbon and the oxygen. Just like in alkenes, the 2pz orbitals that form the pi bond are perpendicular to the plane formed by the sigma bonds.
How is weight affected by the location?
Density Word Problems
Use the following formula to answer the problems. You must SHOW your work!
density = volume
density =
mass
or, in short form:
1. What is the density of carbon dioxide gas if 0.196 g occupies a volume of 100 mL?
Answer:
3CMx 3 cm x 3cm=27CM
2. A block of wood 3.0 cm on each side and has a mass of 27 g. What is the density of
this block?
Answer:
Answer:
3. An irregularly shaped stone was lowered into a graduated cylinder holding a volume
of water equal to 2.0 mL. The height of the water rose to 7.0 mL. If the mass of the
stone was 25 g, what was its density?
Using the formula for density (mass/volume), it's determined that the density of carbon dioxide gas is 0.00196 g/mL, the block of wood is 1 g/mL, and the irregular stone is 5 g/mL.
Explanation:To answer these density problems, we use the formula: density = mass/volume.
1. For carbon dioxide gas, the mass is 0.196 g and the volume is 100 mL. Therefore, the density equals 0.196/100 = 0.00196 g/mL.
2. For the block of wood, the volume is the cube of the side length (3 cm x 3 cm x 3 cm = 27 cm^3 = 27 mL, as 1 cm^3 = 1 mL). The mass is 27 g, so the density equals 27/27 = 1 g/mL.
3. The irregular stone displaces water volume from 2.0 mL to 7.0 mL, which gives a total volume of 5.0 mL. Mass is 25 g, so the density equals 25/5 = 5 g/mL.
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Consider the following precipitation reaction: 2Na3PO4(aq)+3CuCl2(aq)→ Cu3(PO4)2(s)+6NaCl(aq)
What volume of 0.184 M Na3PO4 solution is necessary to completely react with 94.6 mL of 0.108 M CuCl2?
Answer:
V= 37.0 mL
Explanation:
First find the moles of the known substance (CuCl2)
n= cv
where
n is moles
c is concentration
v is volume ( in litres)
n= 0.108 × 0.0946
n=0.0102168
Using the mole ratio in the balanced reaction, we can find the moles of Na3PO4
n (Na3PO4)= n (CuCl2) × 2/3
=0.0102168 × 2/3
=0.0068112
Now we have all the necessary values to calculate the volume
v=n/c
v= 0.0068112/0.184
v= 0.0370173913 L
v= 37.0 mL
37 ml volume of 0.184 M Na₃PO₄ solution is necessary to completely react with 94.6 mL of 0.108 M CuCl₂ solution.
What is molarity?The molarity is the way to express the concentration of the solution. The molarity of any solution can be calculated by dividing the number of mos of solute by the volume of the solution in liters. The unit of the molarity of the solution is mol/L or represented by M.
Given the chemical equation of precipitation reaction:
2Na₃PO₄ (aq) + 3CuCl₂ (aq) → Cu₃(PO₄)₂ (s) + 6NaCl (aq)
Given the volume of 0.108 M CuCl₂ solution = 94.6 ml = 0.946 L
The number of moles of CuCl₂ = M ×V = 0.108 × 0.846 = 0.01022 mol
If 3 moles of CuCl₂ completely react with Na₃PO₄ = 2
Then 0.01022 moles of CuCl₂ will react with Na₃PO₄ :
= (2/3) × 0.01022
= 0.00681 mol
The volume of 0.184 M of Na₃PO₄ required = 0.00681 /0.184 = 37 ml
Therefore, 37 ml of Na₃PO₄ solution is required to completely react with 94.6mL of 0.108 M CuCl₂.
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How many hydrogen Adams are there in 3.14 moles of H2O
Answer:
3.783×10²⁴
Explanation:
We know that one mole of water contain two moles of hydrogen atom and one mole of oxygen atom. shown in following equation:
2H₂ + O₂ → 2H₂O
And
1 mole of hydrogen = 6.022×10²³ atoms of hydrogen
The number 6.022×10²³ is called Avogadro number and it is the number of atoms in one mole of substance. While we have to find the hydrogen atoms in 3.14 moles of water
So the factor 3.14 given in the question contain
3.14×2×6.022×10²³ number of hydrogen atoms which is equal to the 3.783×10²⁴.
Answer:
1.89×10^24 atoms
Explanation:
I mole of hydrogen molecule contains 6.02×10^23 atoms. This is known as the Avogadro's number. The Avogadro's number gives the number of elementary entities contained in one mole of a substance.
One mole of a substance is the amount of that substance that contains the same number of elementary entities as 12g of C-12
Hence 3.14 moles of hydrogen will contain 3.14 ×6.02×10^23= 1.89×10^24 atoms