Question

what volume of oxygen gas O2 measure at 0° c and 1 atmosphere, is needed to burn completely 1 L of propane gas C3H8 measured under the same conditions?​

Answer 1

Answer:

First write a balanced equation:  

C3H8 + 5 O2 = 3 CO2 + 4 H2O  

If the propane and oxygen gases are at the same conditions of temperature and pressure :

1 litre of C3H8 will require 5 litres of O2 gas

Answer 2

1litre of C3H8 5litre of O2 is needed