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PLZ HELP ASAP!!!! A gaseous compound composed of sulfer and oxygen, which is linked to the formation of acid rain, has a density of 3.58 g/L at STP. What is the molar mass of this gas.

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Answer:

81.3 g/mol  

Explanation:

STP is 0 °C and 1 bar.

Under these conditions, 1 mol of a gas occupies 22.71 L.

Mass = volume × density = 22.71 L × 3.58 g/L = 81.3 g

The molar mass of the gas is 81.3 g/mol.

Are you using the old (before 1982) definition of STP? Under that definition, the molar mass of the gas would be 80.2 g/mol.

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