posted by Hannah .
A)What mass of carbon dioxide is produced from the complete combustion of 7.00×10−3 g of methane?
B)What mass of oxygen is needed for the complete combustion of 7.00×10−3 g of methane?
Here is a link that will work all of your stoichiometry problems. Just follow the steps.
Write the balanced equation.
CH4+2O2 >> CO2 + 2H20
for each mole of carbon dioxide produced, one mole of methane, and two moles of oxygen is used.
Moles methane: .007/(16.04)