1.The average rate of effusion for CO2 molecules at room temperature is 409L/s. What is the...
1.The average rate of effusion for CO2 molecules at room temperature is 409L/s. What is the molar mass of a gas whose molecules have an average velocity of 322L/s under the same conditions?
2. A sample of helium, He effuses through a tiny pore in a balloon 6.50 times faster than does an unknown gas X. What is the molar mass of the gas?
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Homework Answers
1.The average rate of effusion for CO2 molecules at room temperature is 409 L/s. What is the molar mass of a gas whose molecules have an average velocity of 322 L/s under the same conditions?
According to Graham,s law,
R2 / R1 = sqrt (M1 / M2)
or
322 / 409 = sqrt (44 / M1 )
or
M1 = 71.0 g / mole.
molar mass of gas = 71.0 g / mole.
2. A sample of helium, He effuses through a tiny pore in a balloon 6.50 times faster than does an unknown gas X. What is the molar mass of the gas?
R2 / R1 = sqrt (M1 / M2)
or
6.50 / 1 = sqrt (M1 / 4.00)
or
M1 = 169 g / mole.
thus
molar mass of gas = 169 g / mole.
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