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Classify the following reactions as endo...

Classify the following reactions as endothermic or exothermic.
(1) `N_(2(g)) + O_(2(g)) + 180.5 kJ to 2NO_((g))`
(2) `4NH_(3(g)) +5O_(2(g)) - 905.6 kJ to 4NO_((g)) + 6H_2O_((g))`
(3) `N_2O_4 (H^@ = 9.16 kJ mol^(-1)) to 2NO_2 (H^@ = 33.2 kJ mol^(-1))`
(4) `N_(2(g)) + 3H_(2(g)) to 2NH_(3(g)) (H_(NH_3)^@ = -46.1 kJ mol^(-1))`
Note : Enthalpy of element is taken as zero`(H_(N_2)^@ = 0),(H_(H_2)^@ = 0)`

Text Solution

Verified by Experts

(1) `Delta H^@ = +180.5 kJ`, endothermic
(2) `Delta H^@ = -905.6 kJ `, exothermic
(3) `DeltaH^@ = 2H_(NO_2)^@ - H_(N_2O_2)^@`
`= 2 xx 33.2 - 9.16 = + 57.24 kJ` endothermic
(4) `DeltaH^@ = 2H_(NH_3)^@ - (H_(N_2)^@ + 3H_(H_2)^@)`
`= 2 xx (-46.1) - (0 + 0) = -92.2 kJ` exothermic
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