JAMB Chemistry 2019 Objective — Question 4

Question 4 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2019 Objective paper, with the correct answer and a full explanation.

The density of a certain gas is 2.5893 gdm⁻³ at s.t.p. What is the molar mass of the gas? [a.m.v. = 22.4dm³]

A. 100gmol⁻¹
B. 58gmol⁻¹Correct
C. 44gmol⁻¹
D. 32gmol⁻¹

Explanation

Density of 2.5893gdm⁻³ means 2.5893g occupies 1dm³ (at stp). Since 1 mole of any gas occupies 22.4dm³ at stp, mass of one mole = 2.5893g/1dm³ × 22.4dm³ = 58g. Molar mass = 58gmol⁻¹.

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