How many grams of water are produced when 3.56 grams of pentane (C5H12) burn with excess oxygen?

Answer 1

C₅H₁₂ + 8O₂ ==> 5CO₂ + 6H₂O ... balanced equation for complete combustion of pentane

Use dimensional analysis to find mass of H₂O produced:

3.56 g C₅H₁₂ x 1 mol/72 g x 6 mol H₂O/mol C₅H₁₂ x 18 g H₂O/mol H₂O = 5.34 g H₂O