Using the equation 2H2+O2-->2H2O, if 192g of water are produced, how many grams of hydrogen must react with it

Based on the given chemical reaction, it can be said that the equation is balanced. To get the amount of Hydrogen needed, back calculation can be done. From 192 g of water, it can be related to its molar mass to convert to the amount of mol. Based on the equation, 1 mol of H2 is equivalent to 2 mol water, by this the amount of H2 needed can be calculated by multiplying to the molar mass (18 g/mol). Below is the calculation:

192 g H2O * (1 mol H2O/18 g H2O) (1 mol H2/2 mol H2O) * (2 g H2/1 mol H2) = 10.67 g H2