an unknown gas effuses 3.87 times faster than H2. What is the molar mass of the gas?
we have a relation
R1 /R2 = (M2/M1)
R1 = 1.0
R2 = 3.87
M1 = 2 g /mol (for H2)
M2 = ?
1.0 / 3.87 = M2 / 2 square on both sides
1.0 / 14.9769 = M2 / 2.0
0.0668 = M2 / 2.0
M2 = 0.133 g /mol
answer = 0.133 g /mol
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