Chemistry

Problem

The rate of disappearance of

A

at two temperatures is given by :

A \rightleftharpoons B

-\frac{d[A]}{dt} = 2 \times 10^{-2} [A] - 4 \times 10^{-3} [B]

300 \text{ K}

II.

-\frac{d[A]}{dt} = 4 \times 10^{-2} [A] - 16 \times 10^{-4} [B]

400 \text{ K}

The heat of reaction for the change is : a.

3.863 \text{ kcal}

6.93 \text{ kcal}

1.68 \text{ kcal}

1.68 \times 10^2 \text{ kcal}