Question

How many grams of hydrogen gas must be "burned" to form 60.0 grams of water?

Answer 1

Are you familiar with combustion reaction?

Answer 2

\[H _{2}+\frac{ 1 }{ 2 }O _{2}\rightarrow H _{2}O\]

so according to the reaction 2*(1.01) grams of hydrogen makes
2*(1.01)+15.999 = 18.019 grams of water so to make 60 grams of water amount of hydrogen required will be equal to

(2.02*60)/18.019 = 6.73 grams