Question
Write the formula of dry ice.
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Answer
Dry ice is solid $\mathrm{CO}_2$ in which there are van der Wall's forces of attraction.
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At 473 K , equilibrium constant $\mathrm{K}_{\mathrm{c}}$ for decomposition of phosphorus pentachloride, $\mathrm{PCl}_5$ is $8.3 \times 10^{-3}$. If decomposition is depicted as,
$\mathrm{PCl}_5(\mathrm{~g}) \rightleftharpoons \mathrm{PCl}_3(\mathrm{~g})+\mathrm{Cl}_2(\mathrm{~g}) \Delta_{\mathrm{r}} \mathrm{H}^{\ominus}=124.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$
what is the value of $\mathrm{K}_{\mathrm{c}}$ for the reverse reaction at the same temperature?
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