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VERIFIED CHEMISTRY ALTERNATIVE (B) 2018 WASSCE MAY/JUNE EXPO IS AVAILABLE NOW

By | On April 23, 2018 (7 months ago)

CHEMISTRY ALTERNATIVE B

B)

i) Concentration of A in mol dm-3
From the reaction equation
CA VA = 1
CB VB 2
CA = CB VB
2 VA
CA = 0.0975 x 25
2 VA
= P mol dm-3

Alternative Method:
Amount of acid used = 0.025 x 0.0975 = 0.00244 mol
From the equation of reaction:
2 mol of B require 1 mol of A
0.00244 mol of B requires ½ x 0.00244 mol of A
= 0.00122 mol of A.
i.e VA cm3 contain 0.00122 mol.
1000 cm3 contain 0.00122 x 1000/VA mol.
i.e. Conc of A = 1.22/VA = P mol dm-3

(ii) Molar mass of H2Y
Molar mass of H2Y = 6.22
P
= Q g mol-1

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