Answer:
0.29 molL-1 or 0.29 M
Explanation:
Now we have to use the formula
n=CV
Where
n= number of moles = 0.87 moles
C= concentration of the solution (the unknown)
V= volume of the solution = 3.00L
Now having specified all parameters except the unknown (molarity if the sodium chloride solution) we can now proceed to find it.
C= n/V
C= 0.87mol/3.00L
C= 0.29 molL-1
Answer:
0.29 mol/L
Explanation:
When sodium chloride (NaCl) is dissolved in water, it will dissociates to produce sodium ion (Na+) and chloride ion (Cl-) in solution as shown below:
NaCl —> Na+ + Cl-
Next, let us calculate the molarity of NaCl. This is illustrated below:
Mole of NaCl = 0.87 mole
Volume of solution = 3 L
Molarity =?
Molarity = mole of solute /Volume
Molarity = 0.87mole /3L
Molarity = 0.29 mol/L
Therefore, the molarity of NaCl is 0.29 mol/L
Please help I’m being timed In many thermodynamically favored reactions, the total bond energy of the products is lower than the total bond energy of the reactants. Therefore, thermodynamically favored reactions are often
A) exothermic
B) endothermic
C) conducted in warm conditions
D) conducted in cold conditions
A sample of gas at STP has a volume of 5.23 L. If the gas volume is changed to 3.45 L at 293 K, calculate the new pressure of the gas.
Answer: P=1.63atm
Explanation:
Stp means standard temperature and pressure
Standard temperature =273k
Standard pressure =1atm
Using the formula
P1V1/T1=P2V2/T2
P1= 1atm
V1=5.23L
T1=273k
P2=?
V2=3.45L
T2=293k
Substitute the values
1×5.23/273=p2×3.45/293
Cross multiply
293×1×5.23=p2×3.45×273
1532.39=941.85p2
P2=1532.39/941.85
P2=1.627
P2=1.63atm
PLEASE HELP LAST QUESTION
what would happen if NO were added to N2(g)+O2(g)->2NO(g) at equilibrium?
a. More NO would form
b. More N2 and O2 would form
c. Keq would increase
d. Keq would decrease
Why is the piece of coal layered?
Answer:
Coal is layered because it is a type of sedimentary rock
Explanation:
How many valence electrons does Bromine have?
Answer:
7
Explanation:
Answer:
Bromine has 7 valence electrons.
Explanation:
Bromine is in group 7 or 17, so it has 7 valence electrons use the Lewis structure for more help.
1. For each of the molecules below, determine the electron geometry, molecule geometry, and bond
angles.
a. CC14 (4 Cl atoms, no lone pairs on C)
b. PF3 (3 Fatoms, 1 lone pair on P)
c. OF2 (2 F atoms, 2 lone pairs on O)
d. 13. (2 1 atoms and 3 lone pairs on central I)
e. A molecule has 2 double bonds on the central atom and no lone pairs. Predict the molecule geometry. What do you think the bond angles would be?
Answer:
CCl4- tetrahedral bond angle 109°
PF3 - trigonal pyramidal bond angles less than 109°
OF2- Bent with bond angle much less than 109°
I3 - linear with bond angles = 180°
A molecule with two double bonds and no lone pairs - linear molecule with bond angle =180°
Explanation:
Valence shell electron-pair repulsion theory (VSEPR theory) helps us to predict the molecular shape, including bond angles around a central atom, of a molecule by examination of the number of bonds and lone electron pairs in its Lewis structure. The VSEPR model assumes that electron pairs in the valence shell of a central atom will adopt an arrangement which tends to minimize repulsions between these electron pairs by maximizing the distance between them. The electrons in the valence shell of a central atom are either bonding pairs of electrons, located primarily between bonded atoms, or lone pairs. The electrostatic repulsion of these electrons is reduced when the various regions of high electron density assume positions as far apart from each other as possible.
Lone pairs and multiple bonds are known to cause more repulsion than single bonds and bond pairs. Hence the presence of lone pairs or multiple bonds tend to distort the molecular geometry geometry away from that predicted on the basis of VSEPR theory. For instance CCl4 is tetrahedral with no lone pair and four regions of electron density around the central atom. This is the expected geometry. However OF2 also has four regions of electron density but has a bent structure. The molecule has four regions of electron density but two of them are lone pairs causing more repulsion. Hence the observed bond angle is less than 109°.
Consider the three equations below. Superscript 14 subscript 7 upper N plus superscript 1 subscript 1 upper H right arrow superscript 15 subscript 8 upper O. Superscript 4 subscript 2 upper H e plus superscript 4 subscript 2 upper H e right arrow superscript 8 subscript 4 upper B e. Superscript 28 subscript 14 upper S i plus 7 superscript 4 subscript 2 upper H e right arrow superscript 56 subscript 28 upper N i. Which statement do these reactions best support?
Answer:
(D)Nuclear fusion plays an important role in making elements that are heavier than helium.Explanation:
Which of these is a problem with using nuclear energy?
A.
It is very expensive to use.
B.
It is a non-renewable energy source.
C.
There aren't enough qualified technicians.
D.
We don't have a way to contain the radioactive waste produced.
Answer:
D
We don't have a way to contain the radioactive waste produced.
Explanation
Nuclear waste is non disposable and takes millions of years to biodegrade and lose it radio activeness
Describe the 3 categories that the periodic table can be divided into. Be prepared to provide this information for an element on the periodic table.
Answer:
Metal, non-metal , and metaliod
Explanation:
Answer:
metal, nonmetal and metalloid
Explanation:
If you burned 4.10 x 10^24 molecules of butane (C4H10), what mass of ethane did you burn?
Answer:
Explanation:
Molar mass of C4H10 = 12x 4 + 1 x 10= 48+ 10=58g.
Also note that molar mass of a substance is equivalent to Avogadro's number (6.02 X 10^-23)
Hence,
6.02 X 10^-23 molecules of ethane was burned in 58g of ethane
So, 4.10 X 10^24 molecules of ethane will burn in xg of ethane.
Cross multiply:
6.02 X 10^-23x = 58 X 4.10 X 10^24
6.02 X 10^-23x = 2.378 X 10 ^26
Dividing both sides by the coefficient of 'x'
x = 2.378 X 10^26/(6.02X 10^-23)
x = 3.95 X10^48g approximately
x = 4.0 X 10^48g
Or
Mole = number of elementary
particless / Avogadro's number
Where,
No of elementary particles= 4.10 X 10^24 molecules
Avogadro's number= 6.02 x 10^-23
Therefore,
Mole = 4.10 X 10^24/ (6.02 X 10^-23)
= 6.81 X 10^ 46 moles.
But mole = mass / molar mass
Mass = mole x molar mass
where
Molar mass of C4H10 = 12x 4 + 1 x 10= 48+ 10=58g/mol
Mass= 6.81 X 10^46 X 58
= 3.95 X 10^48g approximately
= 4.0 X 10^ 48g.
Thanks
Which statement is true about a polyatomic ion?
It forms metallic bonds with other ions.
It forms covalent bonds with other ions.
It is made of atoms that are covalently bonded together.
It has a charge that is distributed over part of the entire unit.
*
Answer:
It is made of atoms that are covalently bonded together.
Explanation:
For example the carbonate ion CO3++.
The carbon and oxygen atoms are held together by covalent bonds.
Answer:
"It is made of atoms that are covalently bonded together." (C)
Explanation:
Polyatomic ion is made of three atoms that are covalently bonded together
Edg. 2020 :)
In the following reaction, how many moles of H2O are created when 7 moles of oxygen are consumed?
A.3 mol of CO2
B.5 mol of O2
C.72.08 grams of H2O
D.6 moles of H2O
F.1 mol of C3H8
Answer:
C
Explanation:
You can see in the chemical equation that 7 [tex]O_{2}[/tex] are used up to produce 6[tex]H_{2}O[/tex]
A student needed to make 100.0 mL of 0.20M NaOH solution. How many grams of sodium hydroxide does the student need to weigh out
Answer:
0.08 g
Explanation:
100.0 mL = 0.10 L
Multiply the volume by the molarity to find moles.
0.10 L × 0.20 M = 0.002 mol
Convert moles to grams.
0.002 mol × 40 g/mol = 0.08 g
Final answer:
To prepare 100.0 mL of 0.20M NaOH solution, a student needs to weigh out 0.80 grams of NaOH, using the molar mass of NaOH and the desired solution volume and concentration.
Explanation:
Calculating the Mass of NaOH Needed for 0.20M Solution
To determine the mass of sodium hydroxide (NaOH) necessary to prepare a 100.0 mL of 0.20M NaOH solution, we have to follow multiple steps:
Calculate the number of moles of NaOH required using the formula Molarity (M) = Moles of solute (mol) / Volume of solution in liters (L).
Convert the volume from mL to L, since the molarity formula requires volume in liters.
Use the molar mass of NaOH to convert moles to grams.
First, we calculate the moles needed:
0.20 mol/L * 0.100 L = 0.020 mol NaOH
Next, we determine the mass of NaOH using its molar mass:
Molar mass of NaOH = 40.00 g/mol
Mass of NaOH = Moles * Molar mass
Mass of NaOH = 0.020 mol * 40.00 g/mol = 0.80 g NaOH
Therefore, the student would need to weigh out 0.80 grams of NaOH to prepare a 100.0 mL of 0.20M NaOH solution.
what type of energy does a saxophone player have and what energy does it turn into
can someone answer this
Answer:
Explanation:
10 N right
How many grams of CaF2 are present in 1.25 L of a 0.15 M solution of CaF2? How do I find the grams I am confused on that part?
Answer:
Mass = 14.64 g
Explanation:
Given data:
Volume of solution = 1.25 L
Molarity of Solution = 0.15 M
Mass of CaF₂ = ?
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
We will calculate the number of moles of CaF₂ and then determine the mass by using number of moles.
0.15 M = number of moles of solute / 1.25 L
number of moles of solute = 0.15 M × 1.25 L
number of moles of solute = 0.1875 mol/L × L
number of moles of solute = 0.1875 mol
Mass in gram:
Mass = number of moles × molar mass
Mass = 0.1875 mol ×78.07 g/mol
Mass = 14.64 g
The Mass of CaF₂ is 14.64 g. Molarity is the ratio of number of moles over the volume of solution.
Given:
Volume of solution = 1.25 L
Molarity of Solution = 0.15 M
To find:
Mass of CaF₂ = ?
What is Molarity?Molarity is used to describe the concentration of solution. It is given by number of moles divided by volume of solution in litres.
Molarity = number of moles of solute / L of solution
We will calculate the number of moles of CaF₂ and then determine the mass by using number of moles.
0.15 M = Number of moles of solute / 1.25 L
Number of moles of solute = 0.15 M * 1.25 L
Number of moles of solute = 0.1875 mol/L * L
Number of moles of solute = 0.1875 mol
Calculation of mass:
Mass = number of moles / molar mass
Mass = 0.1875 mol *78.07 g/mol
Mass = 14.64 g
Thus, the mass of CaF₂ is 14.64 grams.
Find more information about Molarity here:
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Why did Thomson’s results from experimenting with cathode rays cause a big change in scientific thought about atoms?
A.His results gave people a picture of what atoms look like for the first time.
B.His results gave the first clues that atoms could be created and destroyed.
C.His results gave the first experimental evidence that matter is made up of atoms.
D.His results gave the first evidence that atoms were made up of smaller particles.
Answer:
D, because he discovered electrons
Explanation:
His results gave the first evidence that atoms were made up of smaller particles.
Name four metals and non-metals, and state
one major use of each
Answer:
Metals
1) Sodium : It is used in the formation of table salt i. e. sodium chloride.
2) Copper : It is used in the wires of electricity due to better conduction.
3) Silver : It is used in wires and for making jewelry.
4) Aurum: It is used for making jewelry.
Non metals
1) Chlorine : It is used in the production of sodium chloride salt which is used in foods.
2) Flourine : It is used in making toothpaste.
3) Hydrogen : It is used in the formation of acids.
4) Oxygen : It is widely used in the production of steel and plastic.
What seems to be the general relationship between an atom's atomic number and it’s placement on the Periodic Table?
Answer:number of protons in the nucleus and number of electrons in the different shell
explained : determine the position in the periodic table. ... Their position is decided by their Atomic Number which is the number of protons in the nucleus of the atom.
How many mL of 3.0M HCl are needed to make 300.0 mL of a 0.10M HCl?
a
0.001 mL
b
none of the above
c
10 mL
d
0.10 mL
Answer:
V₁ = 10 mL
Explanation:
Given data:
Initial volume of HCl = ?
Initial molarity = 3.0 M
Final molarity = 0.10 M
Final volume = 300.0 mL
Solution:
Formula:
M₁V₁ = M₂V₂
M₁ = Initial molarity
V₁ = Initial volume of HCl
M₂ =Final molarity
V₂ = Final volume
Now we will put the values.
3.0 M ×V₁ = 0.10 M×300.0 mL
3.0 M ×V₁ = 30 M.mL
V₁ = 30 M.mL /3.0 M
V₁ = 10 mL
Which type of reaction occurs in the following equation?
2NO2(g) + 2OH"(aq) —— NO2(aq) + NO, (aq) +H2O(1)
a combination redox reaction
a displacement redox reaction
a synthetic redox reaction
a disproportionation redox reaction
Answer:
A disproportionation redox reaction
Explanation:
1. Assign an oxidation number to every atom in the equation
[tex]2\stackrel{\hbox{$\mathbf{+4}$}}{\hbox{N}}\stackrel{\hbox{-2}}{\hbox{O }}_{2} + 2\stackrel{\hbox{-2}}{\hbox{O}}\stackrel{\hbox{+1}}{\hbox{H}^{-}} \longrightarrow \, (\stackrel{\hbox{$\mathbf{+3}$}}{\hbox{N}}\stackrel{\hbox{-2}}{\hbox{O }}_{2})^{-} + (\stackrel{\hbox{$\mathbf{+5}$}}{\hbox{N}}\stackrel{\hbox{-2}}{\hbox{O}_{3}})^{-} +\stackrel{\hbox{+1}}{\hbox{H}}_{2}\stackrel{\hbox{-2}}{\hbox{O}}[/tex]
2. Identify the atoms that change their oxidation number
N in NO₂: +4 ⟶ +3 in NO₂⁻
N in NO₂: +4 ⟶ +5 in NO₃⁻
3. Identify the type of change
This is a disproportionation — a reaction in which one substance is simultaneously oxidized and reduced.
Answer:
D
Explanation:
If an atom has 10 protons, 10 neutrons, and 10 electrons, what is the atomic mass of the atom?
Answer:
20.179
Explanation:
The answer is 20.179 because the element you are talking about is the element Neon, which has the atomic mass of 20.179.
How many moles of calcium atoms do you have if you have 3.00 × 10²¹ atoms of calcium. (The mass of one mole of calcium is 40.08 g.)
Answer:
4.98x10^-3 mole
Explanation:
According to Avogadro's hypothesis, 1 mole of any substance contains 6.02x10^23 atoms. This greatly implies that 1 mole of calcium will also contain 6.02x10^23 atoms.
Now, if 1 mole of calcium contains 6.02x10^23 atoms,
then Xmol of calcium will contain 3x10^21 atoms i.e
Xmol of calcium = 3x10^21/6.02x10^23
Xmol of calcium = 4.98x10^-3mol
Therefore, 4.98x10^-3 mole of calcium contains 3x10^21 atoms
3.00 × 10²¹ atoms of calcium are equivalent to 4.98 × 10⁻³ moles of calcium atoms.
To convert atoms to moles we need a conversion factor: Avogadro's number. According to Avogadro's number: there are 6.02 × 10²³ calcium atoms in 1 mole of calcium atoms. The number of moles corresponding to 3.00 × 10²¹ atoms of calcium are:
[tex]3.00 \times 10^{21} atoms \times \frac{1 mol}{6.02 \times 10^{23} atoms} = 4.98 \times 10^{-3} mol[/tex]
3.00 × 10²¹ atoms of calcium are equivalent to 4.98 × 10⁻³ moles of calcium atoms.
You can learn more about Avogadro's number here: https://brainly.com/question/13302703
When a chemical reaction occurs, _____.
a phase change takes place
the physical and chemical properties of the products are different from the reactants
the physical and chemical properties of the reactants are the same as the properties of the products
the compounds can be separated by physical means
Answer: When a chemical reaction occurs, _____.
a phase change takes place
the physical and chemical properties of the products are different from the reactants
Explanation:
A chemical change is like dynamite exploding or iron rusting. It's an actual change in the chemical makeup resulting in a new product
A chemical reaction results in the production of new substances with physical and chemical properties that are different from the reactants, unlike a physical change which does not alter the molecular structure of the substance.
Explanation:When a chemical reaction occurs, the physical and chemical properties of the products are different from the reactants. A chemical reaction involves a change in the composition of the substances in question where bonds between atoms are broken and/or formed, resulting in the production of new substances. These new products exhibit different physical and chemical properties such as melting point, color, taste, etc. This is in contrast to a physical change which only affects the appearance or form of a substance without altering its molecular structure. Chemical changes are often more difficult to reverse than physical changes. For example, combining hydrogen and oxygen to produce water is a chemical change because it results in the formation of a new substance with different properties than those of the individual reactants.
what volume of oxygen gas is equal to 4.5 miles at STP
Answer:
i believe this is the answer The most common example is the molar volume of a gas at STP (Standard Temperature and Pressure), which is equal to 22.4 L for 1 mole of any ideal gas at a temperature equal to 273.15 K and a pressure equal to 1.00 atm.
Explanation:
A hangar is a _____.
A) storage area for planes
B) place of fame
C) place to hide jewels
D) a tool to hang clothes on
Answer:
a
Explanation:
a is the 100% correct answer
0.5 moles of any gas is at STP, it will occupy how many LITERS of volume?
Answer: 500L
Explanation:
No of moles= volume× molarity/1000
No of moles =0.5moles
Volume=?
Molarity of a gas at stp = 1M
Stp means standard temperature and pressure
No of moles = volume ×molarity/1000
Substitute the values
0.5=volume×1/1000
Cross multiply
Volume = 1000×0.5
Volume = 500L
The volume is 500L
Why do the nuclides that are used as radiotracers have short half-lives?
Step 3: Measure the Reaction Rate at 40°C
Using tongs, place the 250 ml beaker on the hotplate.
Temperature of the water:
°C. Reaction time:
seconds DONE
Answer:
Temperature of water is 40
Reaction Time is 26.3
Explanation:
Hope this helps
A reaction's rate can be used as a valuable diagnostic tool. The temperature of water is 40° C, and the rate of reaction is 26.3.
What is rate of reaction ?The speed at which a chemical reaction occurs is known as the reaction rate or rate of reaction. It is proportional to the rise in product concentration per unit time and the fall in reactant concentration per unit time. Reaction times might differ significantly.
We may devise strategies to increase production by learning how quickly things are created and what slows down reactions. This knowledge is necessary for the industrial production of various chemicals, such as fertilizers, medications, and home cleaners.
The change in a reactant or product's concentration over time is what is referred to as the rate of a chemical reaction. Concentration is measured in moles per liter, or molar, and time is measured in seconds. Therefore, we use molar per second to indicate the pace of a chemical reaction.
Thus, the temperature of water is 40° C, and the rate of reaction is 26.3.
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Which best describes nuclear fission?
A. the burning of carbon
B. the decay of radioactive isotopes
C. the splitting apart of atomic nuclei
D. the release of a tiny packet of energy
Answer:
It's C.
Explanation:
Firstly, the burning of carbon produces C02, a greenhouse gas. As nuclear fission does not produce carbon dioxide, it is not A. The decay of radioactive isotopes is not fission, or spliting into 2 parts.
As fission means to split, it is C.