cameroon gce A level June 2018 chemistry 2

cameroon gce A level June 2018 chemistry 2

SECTION A: PHYSICAL AND GENERAL CHEMISTRY
1. This question is on the mole concept, bonding, equilibria and energetics,
(a) Define moleof a substance.
(1 mark)
(b) 25 cm3 of a 0.005 moldin3 solution of hydrated sodium thiosulphate(Na2 S2O3.5H2O) was mixed with 25 cnT of 0.05 mol dm3 iodine solution and allowed to react.
(i) Calculate the number of mole
   25 cm3 of a 0.005 moldin’3 solution of hydrated sodium thiosulphate(Na2 S2O3.5H2O) was mixed with 25 cnT of 0.05 mol dm”3 iodine solution and allowed to react.

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