Determine the combustion of propane gas, C3H3(g), with oxygen to form CO2(g) and H2O(l) under standard conditions: (4 marks)
C3H8(g) + O2(g) CO2(g) + H2O(l)

Using the following sets of reactions:
C(s) + H2(g) C3H8(g) ∆H = 103.85 kJ/mol
C(s) + O2(g) CO2(g) ∆H = ─393.5 kJ/mol
H2(g) + O2(g) H2O(l) ∆H = ─285.8 kJ/mol
H2(g) + O2(g) H2O(g) ∆H = ─241.8 kJ/mol


if someone could please help me with the step by step of this