Balance the following chemical equation:

Sulfuric Acid (H2SO4) + Calcium Carbonate (CaCO3) --> ?

[The 2, 4 and 3 are all subscript (little numbers positioned below), I just did not know how to use them on this message if it is even possible]:confused:

Write out and balance the following combustion reactions: C3H4 (Propyne) + O2
C4H8 (cyclobutane) + O2