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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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Un estudiante debe preparar una disolución 2M de NaCl (58,44 g/mol) en un recipiente de 7L. ?Cuántos gramos de NaCl debe agregar
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Answer:

818.2 g.

Explanation:

  • Molarity is the no. of moles of solute per 1.0 L of the solution.

<em>M = (no. of moles of NaCl)/(Volume of the solution (L))</em>

<em></em>

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∴ (2.0 M) = (no. of moles of NaCl)/(7.0 L)

∴ (no. of moles of NaCl) = (2.0 M)*(7.0 L) = 14.0 mol.

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<em></em>

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