The following data for the reaction:
A(g) + 2B(s) ⇌ AB₂(g) provides evidence that the reaction is exothermic.

$\begin{array}{|l|l|}\hline \text { Temperature }(\mathrm{K}) & \mathrm{K}_{\mathrm{c}} \\\hline 300 & 1.5 \times 10^{4} \\\hline 600 & 55 \\\hline 900 & 3.4 \times 10^{-3} \\\hline\end{array}$

Question

The following data for the reaction:
A(g) + 2B(s) ⇌ AB₂(g) provides evidence that the reaction is exothermic.

\begin{array}{|l|l|}\hline \text { Temperature }(\mathrm{K}) & \mathrm{K}_{\mathrm{c}} \\\hline 300 & 1.5 \times 10^{4} \\\hline 600 & 55 \\\hline 900 & 3.4 \times 10^{-3} \\\hline\end{array}

Quizplus · Accepted Answer

The fact that the reaction produces gas (AB₂(g)) indicates that it is exothermic. Additionally, the presence of a coefficient of 2 in front of the solid reactant B(s) also suggests that the reaction is exothermic.

The Following Data for the Reaction: A(g) + 2B(s) ⇌

The Following Data for the Reaction:
A(g) + 2B(s) ⇌