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AveGali [126]
3 years ago
14

Under certain conditions, neon (Ne) gas diffuses at a rate of 4.5 centimeters per second. Under the same conditions, an unknown

gas diffuses at a rate of 10.1 centimeters per second. What is the approximate molar mass of the unknown gas?
Chemistry
2 answers:
Eva8 [605]3 years ago
6 0
Mv^2 = const 
<span>m ~ 1/v^2 </span>

<span>(4.5/10.1)^2 = 0.198 </span>

<span>20.2 * 0.198 = 4.0 g/mol (Helium)</span>
Masteriza [31]3 years ago
6 0

Answer: 4 g/mol

Explanation:

To calculate the rate of diffusion of gas, we use Graham's Law.

This law states that the rate of diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows:

\text{Rate of diffusion}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}

Molar mass of neon =  20 g/mol

Molar mass of unknown gas = ?g/mol

For the rate of diffusion of neon to unknown gas (X), we write the expression:

\frac{Rate_{Ne}}{Rate_{X}}=\sqrt{\frac{M_{X}}{M_{Ne}}}

\frac{4.5}{10.1}=\sqrt{\frac{M_{X}}{20}

{M_{X}}=4g/mol

Hence, the approximate molar mass of the unknown gas is 4 g/mol

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If 1000. mL of water freezes, which of the following is a reasonable approximation for the volume of the resulting ice?
Fudgin [204]

Answer:

If 1000. mL of water freezes, which of the following is a reasonable approximation for the volume of the resulting ice?

Group of answer choices

1000. mL

961 mL

1040 mL

Explanation:

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The reason is the volume occupied by the same mass of ice with water is more than the volume occupied by water. Ice has more empty space within it.

Due to this reason, ice floats on water.

When 1000ml of water freezes to ice then its volume is greater than water.

Among the given options the correct answer is 1040 mL .

7 0
3 years ago
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Mrrafil [7]

Answer:

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5 0
3 years ago
What is the Molarity of a Ca(OH)2 solution if 30.0mL of the solution is neutralized by 26.4mL of 0.25M HCI
ale4655 [162]

Answer:

0.11M

Explanation:

What is the Molarity of a Ca(OH)2 solution if 30.0mL of

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26.4 ml contains ( 26.4 X0.25/1000) moles of H ion ion

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SO 2 H IONS NEUTRALIZE 1 Ca(OH)2 MOLECULE

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the 0.0033 moles are distributed over 30 ml, so the concentration of the

Ca(OH)2 IS 0,0033/(30/1000) =0.11 moles/liter or 0.11M

3 0
3 years ago
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For the given set of quantum numbers, value of n is 3. So, the possible values of l would be 0,1 and 2.

The value of l for the given set of quantum numbers is 3 which is the reason why the given set is not possible.

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3 years ago
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