Calculate the heat of formation for pentane (C5H12)

5C (s) + 6H2 (g) →C5H12 ; ∆Hf = ?

r just means there's a number of carbon in teh chain. for example rcooh means that after x number of carbon, the chain ends with cooh.

explanation:

1.solid

2.carbon dioxide

3.helium

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.