A mixture of H_{2} N_{2} and O_{2} occupying 100 ml underwent reaction so as to form H_{2}*O_{2}(l) and N_{2}*H_{2}(g) as the only products, causing the volume of contract by 60 ml. The remaining mixture was passed through pyragallol causing a contraction of 10 ml. To the remaining mixture excess H₂ was added and the above reaction was repeated, causing a reduction in volume of 10 ml. (No other products are formed)

What is the mole percent of N_{2} in the initial mixture?