Predict the sign of the entropy change, ${}_{r}S,$ for each of the reaction displayed.

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$A$:$A{g}^{+}(aq)+B{r}^{-}(aq)$AgBr$(s),B$:$CaC{O}_3(s)$CaO$(s)+C{O}_2(g)$

$C$:$2N{H}_3(g)N_2(g)+3H_2(g),D$:$2H_2(g)+O_2(g)2H_{2}O(l),E$:$C_7{H}_{16}(g)+11O_2(g)7C{O}_2(g)+$

Negative

Part B

Calculate the standard entropy change for the reaction

$2H_2(g)+O_2(g)2H_{2}O(l)$

using the data from the following table:

$\backslash$table$[[$Substance$,{}_{f}H(kJmo{l}^{-1}),{}_{f}G(kJmo{l}^{-1}),S(J{K}^{-1}mo{l}^{-1})$