Explanation:
A thermochemical equation includes the balanced chemical reaction and change in enthalpy value.
A thermochemical equation is a balanced chemical equation in which the exact value of enthalpy change, physical states and number of moles of reactants and products are specified. Following is the example of thermochemical equation between methane and oxygen.
CH4(g)+2O2(g) → CO2(g) + 2H2O(l)ΔHo = −890kJ
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$PH _{3}, B _{2} H _{6}, CCl _{4}, NH _{3}, LiH$ and $BCl _{3}$ is ..... .
i.$\frac{\text{K}^+}{\text{K}}=-3.02\text{V}$ ii.$\frac{\text{Cu}^{2+}}{\text{Cu}}=+0.34\text{V}$
iii.$\frac{\text{Hg}^{2+}}{\text{Hg}}=0.92\text{V}$ iv.$\frac{\text{Cr}^{3+}}{\text{Cr}}=-0.74\text{V}$
Decreasing order of reducing power of these elements is: