In a hypothetical reaction `X rarr Y`, the activation energy for the forward and backward reactions is `15` and `9 kJ mol^(-1)`, respectively. The potential energy of `X` is `10 kJ mol^(-1)`. Then
Plot `t_(1//2)` vs. concentration

Options

A. The heat of reaction is `6kJ`
B. The potential energy of `Y` is `16 kJ`.
C. The threshold energy of the reaction is `25 kJ`.
D. The reaction is endothermic.

Answer

A, B, C, D

Explanation

For reaction `XrarrY`

`E_(a(f)) = 15kJ mol^(-1), E_(a(b)) = 9 kJ mol^(-1)`
Heat of reaction `E_(a(f)) - E_(a(b)) = 15-9 = 6kJ mol^(-1)`
Potential energy of `Y` is `= 10+6 = 16 kJ`
Threshold energy of the reaction `= PE` of `X+E_(a(f))`
`= 10 kJ+15 kJ`
`= 25 kJ`
The reaction is endothermic because `E_(a(f)) gt E_(a(b))`