JAMB Chemistry 2023 Objective — Question 12

Question 12 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2023 Objective paper, with the correct answer and a full explanation.

What is the molar mass of a gas if 2.0 g of the gas occupies a volume of 400 cm³ at STP?

A. 28 g mol⁻¹
B. 14 g mol⁻¹
C. 56 g mol⁻¹
D. 112 g mol⁻¹Correct

Explanation

Moles = 400/22400 = 0.01786 mol. Molar mass = mass/moles = 2.0/0.01786 = 112 g mol⁻¹.

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