How many liters of oxygen are required to react completely with 2.4 liters of hydrogen to form water? 2H2(g)+O2(g)2H2O(g)?

2 Answers
Apr 30, 2017

Why 1.2L precisely..........

Explanation:

Recall old Avogadro's hypothesis...........

Equal volumes of gases contain AN EQUAL NUMBER of PARTICLES

And thus if there are 2.4L of dihydrogen, stoichiometric equivalence requires 1.2L of dioxygen. How many litres of water gas result?

Apr 30, 2017

1.2L

Explanation:

Know that one mole of any gas at STP takes up 22.4 liters. So 2.4 L of hydrogen is 0.107142857molsH2.

Since H2 reacts with O2 in a 2:1 ratio, to completely react the two you will need half as much oxygen as hydrogen.

mols O2=0.107142857molsH22

mols O2=0.053571429mols

To find liters of oxygen, just multiply the moles above by 22.4 liters.

liters O2=0.053571429mols22.4Lmols

liters O2=1.2L