Chemistry - Chemical Equilibrium Question with Solution | TestHub
For the reaction 2P(s) + Q(g) ⇌ R(g) + 2S(s) + T(s), the extent of reaction of Q was found to be 15% at 350 K and 21% at 550 K. The rate of backward reaction at equilibrium
Options:
Answer:
Solution:
Solids have constant activity. Therefore, the equilibrium constant Kc is given by Kc = ([R])/([Q]). Since Q and R have equal stoichiometric coefficients, the extent of reaction of Q determines the ratio ([R])/([Q]) and is independent of pressure.
The equilibrium composition, and thus the backward rate at equilibrium, is solely determined by temperature.
Upon heating, the extent of reaction increases from 15% to 21%. This indicates that Kc increases, meaning the reaction is endothermic.
Heating increases both the forward and backward rate constants, as well as the equilibrium rate.
The backward rate depends only on temperature and increases with it, which corresponds to option (a).
