Answer to Question #140164 in General Chemistry for Stephanie

Question

How many grams of water should be produced from 2 g H2 and 16 g O2?

Answer 1

2H₂+O₂=2H₂O

At first, the limiting reagent should be found.

n=m/M,

n(H₂)=2/2=1(mol),

n(O₂)=16/32=0.5(mol).

According to the chemical equation, the ratio of moles of H₂:O₂ should be 2:1 (or 1:0.5), the same as it is given. So, all the reagents are consumed.

m(H₂O)=2+16=18(g).