Answer:
64.0 g/mol.
Explanation:
- Thomas Graham found that, at a constant temperature and pressure the rates of effusion of various gases are inversely proportional to the square root of their masses.
<em>∨ ∝ 1/√M.</em>
where, ∨ is the rate of diffusion of the gas.
M is the molar mass of the gas.
<em>∨₁/∨₂ = √(M₂/M₁)</em>
∨₁ is the rate of effusion of the unknown gas.
∨₂ is the rate of effusion of He gas.
M₁ is the molar mass of the unknown gas.
M₂ is the molar mass of He gas (M₂ = 4.0 g/mol).
<em>∨₁/∨₂ = 0.25.</em>
∵ ∨₁/∨₂ = √(M₂/M₁)
∴ (0.25) =√(4.0 g/mol)/(M₁)
<u><em>By squaring the both sides:</em></u>
∴ (0.25)² = (4.0 g/mol)/(M₁)
∴ M₁ = (4.0 g/mol)/(0.25)² = 64.0 g/mol.
Yo sup??
1 lmole of O2 contains 22.4 litre
therefore 10.2 miles will contain
=10.2*22.4
=228.48 litre
Hence the correct answer is option D
Hope this helps
The theory about global warming will be most strongly affected by scientific studies that reveal how the earth’s temperature has fluctuated in the past. The answer is letter C. According to NASA, carbon dioxide levels have increase to
nearly 38 percent as of 2009 due to the burning of fossil fuels, cutting down
carbon-absorbing forests.
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The 4 second rule is used to estimate your total stopping distance under ideal conditions.