The products of a combustion reaction is always CO2 + H20, then you would balance it out with the whole equation.
In this case it would be:
C3H8 + O2 -> CO2 + H2O
Balanced:
C3H8 + 5O2 -> 3CO2 + 4H2O
Balanced Equation: H2SO4 + 2NaOH --> 2H2O + Na2SO4
Moles= Mass/RMM
= 65.5/40
= 1.6375
Mole Ratio = 2:2
= 1.6375
Mass (H2O) = 1.64 x 18
= 29.5 g
Covalent bond forms between the oxygen and hydrogen atoms.
(I attached a picture that could help)
-Hope that helps,
Good luck!