DwightEaston
Answered

Given the balanced equation representing a reaction:2H2 + O2 ==> 2H2O
What is the mass of H2O produced when 10.0 grams of H2 react completely with 80.0 grams of O2?
(1) 70.0 g (2) 90.0 g (3) 180. g (4) 800. g



Answer :

lulu1991
The answer is (2) 90.0 g. The reaction equation represents the ratio of mole number of every compounds. So we need to transfer the mass to mol first. There is 5 mol H2 and 5 mol O2. According to equation, we can know production is 5 mol, too. So the mass is 90 g.