Question

> Q. 10) Detgermine weather the reaction will be spontaneous or nonspontaneous uder standard
conditions. Zn + Cu* → Zn** + Cu AH'=--219 KJ AS =-21 JK​

Answer 1

Answer:

2A(g) + B(g) -------> 2D(g) : ΔU° = -10.5 KJ

Δng = np - nr 

      = 2 - (2 + 1) = 2 - 3 = -1 

ΔH° = ΔU° + ΔΔngRT,  from formula,

      = -10.5 KJ + (-1) × 0.008314 KJ/K/mol × 298K

      =-10.5 KJ - 2.447 KJ

      = -12.947 KJ

now, use the formula, ΔG° = ΔH° - TΔS°

                                          = -12.947 KJ - 298K × (-44 × 10⁻³ J/K)

                                          = -12.947 KJ + 13.14 KJ

                                          = +0.165 KJ

the reaction will not occur spontanteously because ΔG° is positive.