Question

heat of combustion for c,h2,ch4 are-94,-68,-213kcal/mol then delta h for c+2h2==ch4

Answer 1

In this question, you need to list down all the information which you are given in order to calculate the the enthlpy for the formation of methane.

The data we need for this are as follows;

Enthalpy  for the combustion of carbon = 94

Enthalpy  for the combustion of hydrogen = -68

Enthalpy  for the combustion of methane = -213

Then to get delta H for the formation of methane ;

dH + (-213)  = 94 + (4 x -68)

= + 35 kcal/mol