Question

Calculate the volume of oxygen required for complete combustion of 20cm3 of ethane (C2H2)

Answer 1

If you don't know the equation equation is

2C2H2 + 5O2=4CO2 + 2H20. According to the gay lussac's law under the same conditions of temperature and pressure gases occupy the same volume at the product and reactant side.

2 mole of ethyne gas occupies 20 cm cube of volume show one mole of ethyne gas occupies 10 centimetre cube volume.

So 5 moles of oxygen occupies 20 x 5 that is 100 cm cube of volume.

Done. Hope it helps