Although mixture of hydrogen and oxygen are highly explosive, pure hydrogen gas itself burns quietly in air with a pale blue flame, producing water vapor. The unbalanced question is:

Question

Calculate the mass (in grams) of water vapor produced when 9.81 g of pure hydrogen gas is burned in air.

Hints: Balance the equation. Get molar mass of H2. Get mole ratio between H2 and H2O. Get molar mass of H2O.

please explain me how to solve this.

Answer 1

2H₂(g) + O₂(g) ==> 2H₂O(g) ... balanced equation

Use the mole ratio in the balanced equation and dimensional analysis to answer this:

9.81 g H₂ x 1 mol H₂ / 2 g x 2 mol H₂O / 2 mol H₂ x 18 g H₂O/mol H₂O = 88.3 g H₂O