Answer to Question #85944 in General Chemistry for Enci Peng

Question

If 7.8 grams of hydrogen reacts with 13.7 grams of oxygen to produce water, how many grams of water would be produced according to the following equation? Round your answer to two decimal places.



2H2 + O2 --> 2H2O

Answer 1

n(H₂)= 7.8g$/ 2 {g \over mol} = 3.9 mol$

n(O₂)= $13.7g/(15.99 {g \over mol}*2) = 0.428 mol$

2H₂ + O₂ $\to$ 2H₂O

n(H₂O)= 2*n(O₂)= 0.428*2=0.856 mol

m(H₂O)=n(H₂O)*M(H₂O) = $0.856mol*18.01 {g \over mol} = 15.42 g$