What volume of ethyne gas at s.t.p. is required to produce 8.4 dm³ of carbon dioxide at s.t.p.?

2C₂H₂ + 5O₂ ⟶ 4CO₂ + 2H₂O

[H = 1, C = 12, O = 16]

If 6 litres of hydrogen and 4 litres of chlorine are mixed and exploded and if water is added to the gases formed, find the volume of the residual gas.

Propane burns in air according to the following equation :

C₃H₈ + 5O₂ ⟶ 3CO₂ + 4H₂O.

What volume of propane is consumed on using 1000 cm³ of air, considering only 20% of air contains oxygen.

Ethane burns in O₂ to form CO₂ and H₂O

2C₂H₆ + 7O₂ ⟶ 4CO₂ + 6H₂O

If 1250 cc. of oxygen is burnt with 300 cc of ethane.

Calculate :

(i) volume of CO₂ formed.

(ii) volume of unused O₂.