Question

For the chemical equilibrium,

CaCO_3(s)  ⇋ CaO_(s) + CO_2(g),

ΔH_r^o can be determined from which one of the following plots?

Answer 1

Correct option (a)

Explanation:

For the reaction,

This is an equation of straight line. When logK_p is plotted against 1/T. we get a straight line.

The intercept of this line = log A, slop = - ΔH_r^o/2.303R

Knowing the value of slope from the plot and universal gas constant R, ΔH_r^o can be calculated.