Question

If 6.12 mol of ethane (C2H6) undergo combustion according to the unbalanced equation C2H6 + O2 −→ CO2 + H2O , how many moles of O2 is required? Answer in units of mol.

Answer 1

The balanced equation is;

2C₂H_6(g) + 7O_2(g) → 4CO_2(g) + 6H₂O_(g)

Mole ratio of ethane to oxygen is 2:7

Moles of ethane = 6.12

Therefore, moles of oxygen = (6.12/2 x 7) = 21.42