JAMB Chemistry 2009 Objective — Question 16

Question 16 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2009 Objective paper, with the correct answer and a full explanation.

If 10.5g of lead (II)trioxonitrate (V) is dissolved in 20cm3 of distilled water at 18C, the solution of the solute in mol dm-3 is

A. 1.60Correct
B. 5.25
C. 16.00
D. 525.00

Explanation

Mass of Pb(NO3)2 = 10.5g. Molar mass of Pb(NO3)2 = 331g/mol-1. Mole of Pb(NO3)2 = 10.5g/331g/mol = 0.03172mol. Volume of distilled water = 20cm3 = (20/1000)dm3 = 1.586moldm-3 = 1.6moldm-3 [Pb=207, N=14, O=16].

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