Question
State and explain Hess’s law of constant heat summation.
| 1. | $2 H _{2( g )}+ N _{2( g )} \longrightarrow N _2 H _{4( g )}$ | $\Delta_{ r } H _1^0=+95.4 kJ$ |
| 2. | $N _2 H _{2( g )}+ H _{2( g )} \longrightarrow 2 NH _{3( g )}$ | $\Delta_{ r } H _1^0=-187.6 kJ$ |
| $3 H _{2( g )}+ N _{2( g )} \longrightarrow 2 NH _{3( g )}$ | $\Delta_{ r } H ^{\circ}=-92.2 kJ$ |
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