Mock Exam Paper 2.pdf - Mock Exam Paper 2 Date: 25/5/22...

Mock Exam
Paper 2
Date: 25/5/22 Max marks: 90
Time: 2hr
1. (a) 0.502 g of an alkali metal sulfate is dissolved in water and excess barium chloride
solution, BaCl
2
(aq) is added to precipitate all the sulfate ions as barium sulfate, BaSO
4
(s).
The precipitate is filtered and dried and weighs 0.672 g.
(i) Calculate the amount (in mol) of barium sulfate formed. [2]
(ii) Determine the amount (in mol) of the alkali metal sulfate present. [1]
(iii) Determine the molar mass of the alkali metal sulfate and state its units. [2]
(iv) Deduce the identity of the alkali metal, showing your workings. [2]
(v) Write an equation for the precipitation reaction, including state symbols. [2]
(b) The reaction below represents the reduction of iron ore to produce iron.
2Fe
2
O
3
+ 3C → 4Fe + 3CO
2
A mixture of 30 kg of Fe
2
O
3
and 5.0 kg of C was heated until no further reaction occurred.
Calculate the maximum mass of iron that can be obtained from these masses of reactants.