In a laboratory 178.8 g of water is separated into hydrogen gas and oxygen gas. the hydrogen gas has a mass of 20.0 g what is the mass of the oxygen gas produced?

Below is the solution:

n equation showing conservation of mass of reactants and products:

2H2O - - > 2H2 & O2

what is the mass of the oxygen gas produced, from 178.8 g H2O, (using molar masses:

178.8 g H2O @ (1mol O2) (@ 32.00 g/mol) / (2molH2O) (18.02g/mol) =

your answer (4 sigfigs) : 158.8 g O2

178.8 g H2O - - - > 20.0 H2 & 158.8 O2