Question

For the chemical equilibrium,
`CaCO_(3)(s) hArr CaO(s)+CO_(2)(g)`
`Delta_(r)H^(ɵ)` can be determined from which one of the following plots?
A.
B.
C.
D.

Answer 1

Correct Answer - A
`CaCO_(3)(s) hArr CaO(s)+CO_(2)(g)`
`K_(p)=P_(CO_(2))`
According to Arrhenius equation:
`K=Ae^(-DeltaHɵ_(r )//RT)`
`"log" K_(p)= log A-(DeltaH_(r)^(@))/(2.303 RT)`
`log P_(CO_(2))=log A-(DeltaH_(r )^(@))/(2.303R)1/T …(i)`
`Y=C+MX`
Graph (a) represents (i) and its slope will be used to determine the heat of the reaction.