The molar mass of a gas that moves 1.25 times as fast as CO2 is 28.16 g.
Molar mass of the gas
The molar mass of the gas is determined by applying Graham's law of diffusion.
R₁√M₁ = R₂√M₂
R₁/R₂ = √M₂/√M₁
R₁/R₂ = √(M₂/M₁)
where;
- R₁ is rate of the CO2 gas
- M₁ is molar mass of CO2 gas
- R₂ is rate of the second gas
- M₂ is the molar mass of the second gas
R₁/1.25R₁ = √(M₂/44)
1/1.25 = √(M₂/44)
0.8 = √(M₂/44)
0.8² = M₂/44
M₂ = 0.8² x 44
M₂ = 28.16 g
Thus, the molar mass of a gas that moves 1.25 times as fast as CO2 is 28.16 g.
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