Question

The combustion of propane (c3h8) produces co2 and h2o: c3h8 (g) + 5o2 (g) → 3co2 (g) + 4h2o (g) the reaction of 2.5 mol of o2 with 4.6 mol of c3h8 will produce ________ mol of h2o.

Answer 1

The answer is 2 mol of H₂O will be produced.
The balanced equation for the chemical reaction is:

c3h8 (g) + 5o2 (g) → 3co2 (g) + 4h2o (g) 
5 moles of O₂ produces 4 moles of H₂O, and when there is 2.5 mol of O₂, moles of H₂O will be:
2.5 x 4/5 = 2 mol of H₂O