how to balance combustion of 5% by volume in air.

Question

1. 0.05 CH4 + ( )(0.21 O2 + 0.79 N2)
2. ( )CH4 + O2 + 0.376 N2

Answer 1

For the life of me, I don't understand your question.

Answer 2

Nor do I. I looked at it several times but it doesn't make sense to me.