For phase transformation of ' A ' ( 90 gm / mole ) : A(s) ⇌ A (ℓ) Δ G 300 0 = − 300 J/mol , Δ H 300 0 = 2700 J/mol . Densities of A(s) and A(ℓ) are 0.9 gm/ml and 1.0 gm/ml , respectively

Question

For phase transformation of ' A ' ( 90 gm / mole ) : A(s) ⇌ A (ℓ) Δ G 300 0 ​ = − 300 J/mol , Δ H 300 0 ​ = 2700 J/mol . Densities of A(s) and A(ℓ) are 0.9 gm/ml and 1.0 gm/ml , respectively. The standard melting point of A is 2 7 ∘ C .

TestHub · Accepted Answer

A(s) ⇌ A( ℓ ) d G = V d P Δ G − Δ G ∘ = Δ V ( P 2 ​ − P 1 ​ ) Δ V = 90 − 100 = − 10 m L = − 10 × 1 0 − 6 m Δ G = Δ G ∘ + Δ V ( P 2 ​ − P 1 ​ ) = − 300 + ( − 10 × 1 0 − 6 ) × ( 1 0 − 5 ) = − 301 J

Chemistry - Thermodynamics - II Question with Solution | TestHub

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