Which of the following processes is expected to have a positive value for the change in entropy? a)CH3 (s) —> CH3OH(l) b) 2 Na (s) + 2 H2O (l) —> 2 NaOH (aw) + H2 (g) c) 2 NO2 (g) —> N2O4(g)
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Generally, the entropy (disorder) increases when a substance changes from a solid to a liquid. So, this process is expected to have a positive change in entropy. Show more…
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Predict whether the entropy change is positive or negative for each of the following reactions. Give reasons for your predictions. (a) $2 \mathrm{KClO}_{4}(s) \longrightarrow 2 \mathrm{KClO}_{3}(s)+\mathrm{O}_{2}(g)$ (b) $\mathrm{H}_{2} \mathrm{O}(g) \longrightarrow \mathrm{H}_{2} \mathrm{O}(l)$ (c) $2 \mathrm{Na}(s)+2 \mathrm{H}_{2} \mathrm{O}(l) \longrightarrow 2 \mathrm{NaOH}(a q)+\mathrm{H}_{2}(g)$ (d) $\mathrm{N}_{2}(g) \longrightarrow 2 \mathrm{N}(g)$
Predict whether the entropy change will be positive or negative for the following: a. H2O (g) --> H2O (l) ?S_____ b. C6H12O6(s) --> 2C2H5OH(l) + 2CO2(g) ?S_____ c. 2NH3(g) + CO2(g) --> H2O(l) + NH2CONH2(aq) ?S_____ d. NaCl(s) --> NaCl(aq) ?S_____ e. Cu(s) (100oC) --> Cu(s) (25oC) ?S_____ f. 2NH3(g) --> N2(g) + 3H2(g) ?S_____
Ma Ednelyn L.
Without consulting Appendix $3,$ predict whether the entropy change is positive or negative for each of the following reactions. Give reasons for your predictions. (a) $2 \mathrm{KClO}_{4}(s) \longrightarrow 2 \mathrm{KClO}_{3}(s)+\mathrm{O}_{2}(g)$ (b) $\mathrm{H}_{2} \mathrm{O}(g) \longrightarrow \mathrm{H}_{2} \mathrm{O}(l)$ (c) $2 \mathrm{Na}(s)+2 \mathrm{H}_{2} \mathrm{O}(l) \longrightarrow$ $2 \mathrm{NaOH}(a q)+\mathrm{H}_{2}(g)$ (d) $\mathrm{N}_{2}(g) \longrightarrow 2 \mathrm{N}(g)$
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