If 12.3 grams of a substance burns in air to produce 15.9 grams of a compound, what mass of the air reacted?

Explanation:

Hello,

In this case, given the law of conservation of mass which states that mass cannot be created nor destroyed, since the produced mass of the compound is 15.9 g and the mass of the initial substance is 12.3 g we obtain the mass of air by applying the following equation:

Thus, solving for the mass of air we obtain:

Regards.

the answer would be c

if you're asking what comes out, it's steam.