JAMB Chemistry 2007 Objective — Question 14

Question 14 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2007 Objective paper, with the correct answer and a full explanation.

What weight of NaCl is needed to make 2.0 dm3 of a 1.5M solution? [Na=23, Cl=35.5]

A. 58g
B. 87g
C. 116g
D. 175gCorrect

Explanation

Moles = concentration x volume = 1.5 x 2.0 = 3.0mol. Molar mass NaCl = 58.5g/mol. Mass = 3.0 x 58.5 = 175.5g (~175g).

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