Top fuel dragsters and funny cars burn nitro-methane as fuel according to the following balanced combustion equation: 2ch3no2(l)+3/2o2(g)→2co2(g)+3h2o(g) +n2(g). the standard enthalpy of combustion for nitromethane is −709.2kj/mol. calculate the standard enthalpy of formation(delta h formation) for nitro-methane.

Answer : The standard enthalpy of formation for nitro-methane is, -467.4 kJ

Explanation :

Enthalpy change : It is defined as the difference in enthalpies of all the product and the reactants each multiplied with their respective number of moles. It is represented as

The equation used to calculate enthalpy change is of a reaction is:  

The equilibrium reaction follows:

The equation for the enthalpy change of the above reaction is:

We are given:

Putting values in above equation, we get:

Thus, the standard enthalpy of formation for nitro-methane is, -467.4 kJ