what is the mass of H2O produced when 10.0 grams of H2 reacts completely with 80.0 grams of O2? A(70.0 grams) B(90.0 grams) C(180.0 grams) C(800.0 grams)
Chemistry · High School · Thu Feb 04 2021
llm
Answered on
Chemical reaction:
2H2 + O2 ----- > 2H2O
Mass of hydrogen, M= 2g/mol
Mass of hydrogen substance, m = 10 g
n = m/M
= 10/2
= 5 mol
Mass of O2, M = 32 g/mol
Mass of O2 substance = 80 grams
n = 80/32
= 2.5 mol
So, Mass of H2O produced = 10 + 80 g
= 90 g
So, option (B) is correct.