A sample of oxygen gas and a sample of an unknown gas are weighed separately in the same evacuated flask. Use the data given below to find the molar mass of the unknown gas (assume experiments are carried out at the same pressure and temperature).
Mass of evacuated flask 124.46g
Mass of flask + oxygen 125.10 g
Mass of flask + unknown gas 125.34 g

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22 g/mol

84 g/mol

38 g/mol

44 g/mol

answer is C.

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Detailed Solution

Mass of oxygen gas= 125.10 - 124.46 = 0.64 g Mass of unknown gas = 125.34 - 124.46 = 0.88 g $n_{O_{2}} = n_{unknown gas}$ $\Rightarrow \frac{0.64}{32} = \frac{0.88}{M}$ $\Rightarrow M = 44$

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Mass of evacuated flask	124.46g
Mass of flask + oxygen	125.10 g
Mass of flask + unknown gas	125.34 g