10. If 200 mL of gas weighs 0.344 grams at STP, what is its molecular mass? (1000 mL = 1 L)

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24-04-2022
Chemistry

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10. If 200 mL of gas weighs 0.344 grams at STP, what is its molecular mass? (1000 mL = 1 L)

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samueladesida43 samueladesida43 · Answer 1 · 2022-04-28T13:51:48+02:00

The molecular mass of the gas if 200 mL of gas weighs 0.344 grams at STP is 38.53g/mol. Details on how to calculate molecular mass can be found below.

How to calculate molecular mass?

The molecular mass of a gas can be calculated by using the following expression:

At STP, the gas weighs 0.344 grams.
volume = 200mL = 0.2L

Molecular weight of the gas = mass × volume at STP (22.4L)/ volume of gas

= 0.344 × 22.4/0.2

= 7.7056/0.2

= 38.53g/mol

Therefore, the molecular mass of the gas if 200 mL of gas weighs 0.344 grams at STP is 38.53g/mol.

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