AnswersCR SS Chemistry S2 201819 2026Dimensional AnalysisQuestion 1
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QuizMultiple Choice

Dimensional Analysis

Question 1 • CR SS Chemistry S2 2018/19 2026

An engineer wants to estimate the mass of gas that is present in a tank. She knows that 1.00 mol of the gas occupies a volume of 24.5 L at the set temperature and pressure. If the volume of the tank is 170.0 L and the molecular weight of the gas is 32.00 g/mol, what is the mass of gas in the tank?

Answer
A
130 g
B
222 g
C
784 g
D
5,440 g

Explanation

First find the amount of gas: 170.0 L ÷ 24.5 L/mol ≈ 6.94 mol. Multiply by the molecular weight: 6.94 mol × 32.00 g/mol ≈ 222 g. The mass is 222 g, choice B.

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