1.
Consider the following processes:

12A→B\frac{1}{2}A \rightarrow B; ΔH=+150 kJ mol−1\Delta H = +150\,\text{kJ mol}^{-1}

3B→2C+D3B \rightarrow 2C + D; ΔH=−125 kJ mol−1\Delta H = -125\,\text{kJ mol}^{-1}

E+A→2DE + A \rightarrow 2D; ΔH=+350 kJ mol−1\Delta H = +350\,\text{kJ mol}^{-1}

For B+D→E+2CB + D \rightarrow E + 2C, ΔH\Delta H will be: