The number of endothermic process/es from the following is _______.
A. ${I}_{2} ( g ) \to 2I ( g )$
B. $HCl ( g ) \to H ( g ) + Cl ( g )$
C. ${H}_{2}O ( l ) \to {H}_{2}O ( g )$
D. $C ( s ) + {O}_{2} ( g ) \to {CO}_{2} ( g )$
E. Dissolution of ammonium chloride in water

Question

The number of endothermic process/es from the following is _______.

A. ${I}_{2} ( g ) \to 2I ( g )$

B. $HCl ( g ) \to H ( g ) + Cl ( g )$

C. ${H}_{2}O ( l ) \to {H}_{2}O ( g )$

D. $C ( s ) + {O}_{2} ( g ) \to {CO}_{2} ( g )$

E. Dissolution of ammonium chloride in water

Quantrex Academy · Accepted Answer

Correct answer: 0

The decomposition reactions are endothermic reactions. The reactions I _ 2 ( g ) → 2I ( g ) and HCl ( g ) → H ( g ) + Cl ( g ) are decomposition reactions. The heat vaporisation is an endothermic reaction. Hence, the conversion of H _ 2 O(l) → H _ 2 O(g) is endothermic process. The heat of combustion is an exothermic process. The heat involved in C ( s ) + O _ 2 ( g ) ⟶ CO _ 2 ( g ) is heat of combustion. The dissolution of ammonium chloride in water is an endothermic process. NH _ 4 Cl ( s ) → NH _ 4 ^ + ( aq ) + Cl ^ - ( aq ) ; Δ H = + 15 . 1kJ / mol .

The number of endothermic process/es from the following is _______....

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