Question
With the help of thermochemical equation given below, determine ∆r.H0 at 298K for the following reactions:
Solution
We aim at the equation
Here we want one mole of C(graphite) as a reactant, so write equation (i) as such. We want two moles of H2(g) as a reactant ; so multiply equation (ii) by 2, we want one mole of CH4(g) as a product, so write equation (iii) as such.
Adding equations (i), (ii) and (iii), we have,
