According to the following reaction, how many grams of hydrogen gas will be formed upon the complete reaction of 32.4 grams of water? water (l) ----> hydrogen (g) + oxygen (g) ??? grams hydrogen gas

Answer 1

Hi again!

This is just like your other problem. It involves finding an amount of a product when given an amount of a reactant = molar ratios and stoichiometry.

1. Balance the reaction: 2H₂O _(l) > 2H_{2 (g)} + O_{2 (g)}
2. information given: 32.4 g H₂O and you need to find grams of H₂
3. there is only 1 ‘reactant’ so no need to find limiting reactant
4. Now set up (check so that units cancel out until you have desired units)

32.4 g H₂O (1 mol H₂O/18.015 g H₂O) (2 mol H₂/2 mol H₂O) (2.016 g H₂/1 mol H₂) = 3.6257… g

Round for sig figs = 3.63 g H₂