Answer:
The problem tells you that
6 g
of hydrogen gas,
H
2
, react with an unknown mass of oxygen gas,
O
2
, to form
54 g
of water.
As you know, the law of mass conservation tells you that the in a chemical reaction the total mass of the reactants must be equal to the total mass of the products.
In your case, this can be written as
total mass of reactants
m
H
2
+
m
O
2
=
mass of product
m
H
2
O
This means that the reaction must have consumed
m
O
2
=
m
H
2
O
−
m
H
2
m
O
2
=
54 g
−
6 g
=
48 g O
2
Explanation:
I'll show you two approaches to solving this problem, one really short and one relatively long.
