Chemistry Mole/Gram and Balance Help?

Question

1. What mass of water is produced from the complete combustion of 8.50×10−3 g of methane?

2. What mass of oxygen is needed for the complete combustion of 8.50×10−3 g of methane?

Answer 1

Methane = CH₄

Combustion of CH₄:

CH₄ + 2O₂ ==> CO₂ + 2H₂O ... balanced equation

1). 8.50x10^-3 g CH₄ x 1 mol CH₄ / 16 g x 2 mol H₂O / mol CH₄ x 18 g H₂O / mol = g H₂O

2). 8.50x10^-3 g CH₄ x 1 mol CH₄ / 16 g x 2 mol O₂ / mol CH₄ x 32 g O₂ / mol = g O₂

Do the math to get the answers.