How many grams of dioxygen are required to completely burn 4.3 g of C₂H₅OH?

Question

Quizplus · Accepted Answer

The balanced chemical equation for the combustion of ethanol (C2H5OH) is: C2H5OH + 3O2 → 2CO2 + 3H2O. The molar mass of C2H5OH is 46 g/mol, so 4.3 g corresponds to 0.0935 mol. According to the equation, 3 moles of O2 are required per mole of C2H5OH, so 0.0935 mol of C2H5OH requires 0.2805 mol of O2. The molar mass of O2 is 32 g/mol, so 0.2805 mol corresponds to 8.976 g, which rounds to 19 g.

How Many Grams of Dioxygen Are Required to Completely Burn