a)What mass of water is produced from the complete combustion of 2.30×10−3 g of methane?

Question

b)What mass of oxygen is needed for the complete combustion of 2.30×10−3 g of methane?

This is the unbalanced equation given:
CH4+O2->CO2+H2O

Answer 1

http://www.jiskha.com/display.cgi?id=1285089963

as an example