Question

For a reaction ΔH = - 30kJ and ΔS = - 45 JK^-1, at what temperature reaction changes from spontaneous to non-spontaneous?

पर्याय

• 666.6 K

• 375.0 K

• 675.0 K

• 777.0 K

Answer 1

675.0 K

Explanation:

n = 2 mol, V₁ = 12.5 L = 12.5 x 10^-3 m³, V₂ = 15.0 L = 15.0 x 10^-3 m³,

P = 760 mm of Hg = 1.013 x 10⁵ Nm^-2

W = - P_ext (V₂ - V₁)

= - 1.013 × 10⁵(15.0 - 12.5)10^-3

= - 2.5325 × 10⁵ × 10^-3

W = - 253.25 J