Find the mass of KNO₃ required to produce 126 kg of nitric acid. Find whether a larger or smaller mass of NaNO₃ is required for the same purpose.

KNO₃ + H₂SO₄ ⟶ KHSO₄ + HNO₃

NaNO₃ + H₂SO₄ ⟶ NaHSO₄ + HNO₃

Pure calcium carbonate and dilute hydrochloric acid are reacted and 2 litres of carbon dioxide was collected at 27°C and normal pressure.

CaCO₃ + 2HCl ⟶ CaCl₂ + H₂O + CO₂

Calculate:

(a) The mass of salt required.

(b) The mass of the acid required

1.56 g of sodium peroxide reacts with water according to the following equation:

2Na₂O₂ + 2H₂O ⟶ 4NaOH + O₂

Calculate:

(a) mass of sodium hydroxide formed,

(b) volume of oxygen liberated at S.T.P.

(c) mass of oxygen liberated.

(a) Calculate the mass of ammonia that can be obtained from 21.4 g of NH₄Cl by the reaction:

2NH₄Cl + Ca(OH)₂ ⟶ CaCl₂ +2H₂O + 2NH₃

(b) What will be the volume of ammonia when measured at S.T.P?