complete combustion of methane

Question

The complete combustion of methane can be seen in the equation:

CH₄+ 2O₂→ CO₂+ 2H₂O

If 50 g of methane are reacted completely, which statement describes the reaction?

a	The total mass of reactants is 50 g.
b	The total mass of reactants is greater than 50 g.
c	The total mass of products is 50 g.
d	The total mass of products is less than 50 g.

Answer 1

b. The total mass of reactants is greater than 50 g.

You have 50 g of methane PLUS the mass of oxygen, so total mass of reactants must be greater than 50 g.