O is what should go in the blank. O stands for Oxygen.
In a combustion reaction, one of the reactants is always oxygen.
Oil or petroleum are nonrenewable resources, the others are renewable resources.
Answer:
32
Explanation:
0.56dm of gas has 0.8g
22.4dm of gas Z has a mass of 22.4/0.56X0.8
the relative molecular mass of gas Z is 32
