Calculate the mass of oxygen gas required to react completely with 4 grams of hydrogen gas to form water, given atomic masses of hydrogen and oxygen as 1 and 16 grams per mole respectively.

💡 Solution & Explanation

The balanced chemical equation for water formation shows that two moles of hydrogen gas react with one mole of oxygen gas to produce two moles of water. Four grams of hydrogen gas represent two moles, which require exactly one mole of oxygen molecules for complete combustion. One mole of oxygen gas has a molar mass of 32 grams, satisfying stoichiometric mass conservation ratios.