Help please!

Question 21. By using the following reactions, calculate the heat of combustion of pentane:
C5H12 (g) + 8O2 (g) ----- 5CO2 (g) + 6H2O (l).
C (s) + O2 (g)---- CO2 (g), dH = 395 kJ
H2 (g) + 1/2O2 (g)---- H2O (l), dH = 285 kJ
5C (s) + 6H2 (g)----- C5H12 (g), dH = 147 kJ

(Points : 3)
-6.80 × 103 kJ

-5.42 × 103 kJ

- 4.16 × 103 kJ

-3.54 × 103 kJ

Question

Help please!

Question 21. By using the following reactions, calculate the heat of combustion of pentane:
C5H12 (g) + 8O2 (g) -----  5CO2 (g) + 6H2O (l).
C (s) + O2 (g)---- CO2 (g), dH = 395 kJ
H2 (g) + 1/2O2 (g)----  H2O (l), dH = 285 kJ
5C (s) + 6H2 (g)----- C5H12 (g), dH = 147 kJ

(Points : 3)
       -6.80 × 103 kJ

       -5.42 × 103 kJ

      - 4.16 × 103 kJ

       -3.54 × 103 kJ