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1. ⇒  (MHT CET 2023 11th May Evening Shift )

Calculate Δ S total  for the following reaction at 300   K .

NH 4 NO 3 (   s ) NH ( aq ) + + NO 3 ( aq )

( Δ H = 28.1   kJ   mol 1 , Δ S sys = 108.7   J   K 1   mol 1 )

A. 15.1   J   K 1   mol 1

B. 93.6   J   K 1   mol 1

C. 84.3   J   K 1   mol 1

D. 202.3   J   K 1   mol 1

Correct Option is (A)

Δ S surr  = Q rev  T = Δ H T = 28.1 × 10 3   J   mol 1 300   K = 93.67   J   K 1   mol 1 Δ S total  = Δ S sys  + Δ S surr  = 108.7 + ( 93.67 ) = 15.03   J   K 1   mol 1