Question

Determine the enthalpy of the reaction, 

C₃H₈ (g ) + H₂(g) ---> C₂H₆(g) + CH₄(g), at 25^oC using the given heat of combustion values under standard conditions. 

Compound : H₂(g ) CH₄ (g) C₂H₆ (g) C(graphite) ΔH^o (kJ/mol): -285.8 - 890.0 -1560.0 -393.5 

The standard heat of formation of C₃H₈(g) is -103.8 kJ/mol.

Answer 1

On the basis of definition of standard heat of combustion, following thermochemical equation is written for combustion of C₃H₈ (g)