Question

For the gas - phase decomposition, PCl5 (g) PCl3 (g) + Cl2 (g) :

• A. $\Delta$H < 0, $\Delta$S < 0
• B. $\Delta$H > 0, $\Delta$S > 0
• C. $\Delta$H > 0, $\Delta$S < 0
• D. $\Delta$H < 0, $\Delta$S > 0

Answer 1

Answer: (B)

$\Delta$H > 0, $\Delta$S > 0

Answer 2

Reaction is endothermic and no. of moles increases on

decomposition.