JAMB Chemistry 2008 Objective — Question 4

Question 4 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2008 Objective paper, with the correct answer and a full explanation.

16.8g of sodium hydrogen trioxocarbonate (IV) is completely decomposed by heat. Calculate the volume of carbon (IV) oxide given off at s.t.p.

A. 22.40dm3
B. 11.20dm3
C. 2.24dm3Correct
D. 1.12dm3

Explanation

2NaHCO3 -> Na2CO3 + H2O(g) + CO2(g). Mole of NaHCO3 = 16.8g/84gmol-1 = 0.2mol. Mole of CO2 = 1/2 x 0.2mol = 0.1mol. Volume = mole x G.M.V = 0.1 x 22.4dm3 = 2.24dm3.

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