Answer :
To find the molar mass of the unknown gas, divide 4.00 g/mol by 4.57, which gives us a molar mass of 0.877 g/mol. the molar mass of the unknown gas is 18.2 g/mol.
The molar mass of the unknown gas can be calculated by dividing the molar mass of helium (4.00 g/mol) by the ratio of the diffusion rate. Helium diffuses 4.57 times faster than the unknown gas, so the molar mass of the unknown gas must be less than 4.00 g/mol. This corresponds to a molar mass of approximately 18.2 g/mol, which is the answer choice.
Know more about diffusion rate here
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