Question

If we wish to burn 3.5 moles of propane, how many moles of oxygen gas is needed?

Answer 1

17.5 moles of oxygen gas

Step-by-step explanation:

Propane burns with the help of oxygen according to the following reaction

`C_3H_8+5O_2=3CO_2+4H_2O`

It can be seen that for 1 mole of propane 5 moles of oxygen is required.

`1\ \text{mol of }C_3H_8=5\ \text{mol of }O_2`

`3.5\ \text{mol of }C_3H_8=3.5* 5=17.5\ \text{mol of }O_2`

The reaction will be

`3.5C_3H_8+17.5O_2=10.5CO_2+14H_2O`

Therefore 17.5 moles of oxygen gas will be needed to burn 3.5 moles of propane.