Answer: an air compressor and desk chair.
Explanation:
For the first one.. the Reactant side is Zn+2HCl produces Zncl2 and H2... and it is balanced too
2Mg+O₂⇒2MgO
It can be a combustion reaction, or it can be a combination reaction
Its going to b 5,800,000 due to each Km being 1,000,000 Mm
Hope this helps :D