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dybincka [34]
2 years ago
9

Select the correct answer.

Chemistry
2 answers:
serg [7]2 years ago
7 0
7^5 as a multiplication expression is 7 x 7 x 7 x 7 x 7
padilas [110]2 years ago
6 0
Answer 1 35
Answer 2 16807
Answer 3 78125
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0.100 mol of CaCO3 and 0.100 mol CaO are placed in an 10.0 L evacuated container and heated to 385 K. When equilibrium is reache
HACTEHA [7]

Answer:

12.531 grams will be the final mass of calcium carbonate.

Explanation:

CaCO_3(s)\rightleftharpoons CaO(s)+CO_2(g)

Partial pressure of carbon dioxide gas at equilibrium =P=0.220 atm

Volume of carbon dioxide gas = V = 10.0 L

Moles of carbon dioxide gas formed = n

Temperature of the gas = T = 385 K

PV=nRT( ideal gas equation)

n=\frac{PV}{RT}=\frac{0.220 atm\times 10.0 L}{0.0821 atm L/mol K\times 385 K}=0.06960 mol

According to reaction , 1 mole of carbon dioxide gas is formed from 1 mole of calcium carbonate,0.06960 mole of carbon dioxide gas will be obtained from :

\frac{1}{1}\times 0.06960 mol=0.06960 mol calcium carbonate

Moles of calcium carbonate at equilibrium = 0.100 mol - 0.06960 mol = 0.03040 mol

After addition of 0.300 atm of carbon dioxide gas, more amount of calcium carbonate will be be formed.

Here, at the same temperature, the equilibrium pressure of the carbon dioxide gas is 0.220 atm so, entire 0.300 atm of carbon dioxide will get convert to calcium carbonate.

So amount moles of carbon dioxide gas added = moles of calcium carbonate formed after re-establishment of an equilibrium :

Partial pressure of carbon dioxide gas added at equilibrium =P=0.300 atm

Volume of carbon dioxide gas = V = 10.0 L

Moles of carbon dioxide gas formed = n

Temperature of the gas = T = 385 K

PV=nRT( ideal gas equation)

n=\frac{PV}{RT}=\frac{0.300 atm\times 10.0 L}{0.0821 atm L/mol K\times 385 K}=0.09491 mol

Moles of calcium carbonate = 0.09491 mol

Total moles of calcium carbonate in the container :

=0.03040 mol + 0.09491 mol = 0.12531 mol

Mass of 0.12531 moles of calcium carbonate :

0.12531 mol × 100 g/mol = 12.531 g

12.531 grams will be the final mass of calcium carbonate.

4 0
3 years ago
A patient is receiving treatments for brain cancer. Which electromagnetic waves are most likely being used as part of the treatm
SVETLANKA909090 [29]
Gamma rays, or rather gamma radiation are most commonly used.
5 0
3 years ago
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You have 500,000 atoms of a radioactive substance. After 2 half-lives have past, how many atoms remain?
Aleonysh [2.5K]

Answer:

125000

Explanation:

Because it is halved and halved again.

3 0
2 years ago
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What do you think happens to the bonds between atoms when substances melt?
Eduardwww [97]

Answer:

As a substance melts, and goes from a solid to a liquid state, the kinetic energy of the molecules increases, and the molecules move faster, and they separate further and further away from each other.  The intermolecluar forces holding the molecules together become weaker.  This is why a liquid can take fill the shape of its container, whereas a solid has a fixed shape.

Explanation:

take your notes man

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Which of these compounds are oxidizing agents?
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i guess its e) Mn (VII)

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