InterviewSolution
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InterviewSolution
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Calculate `Delta_(f)H^(@)` (in kJ/mol) for `Cr_(2)O_(3)` from the `Delta_(r)G^(@)` and the `S^(@)` values provided at `27^(@)` `4Cr(s)+3O_(2)(g)rarr2Cr_(2)O_(3)(s)," "Delta_(r)G^(@)=-2093.4kJ//mol` `S^(@)("J//K mol") : S^(@)(Cr,s)=24," "S^(@)(O_(2),g)=205," "S^(@)(Cr_(2)O_(3),s)=81`A. `-2258.1kJ//mol`B. `-1129.05kJ//mol`C. `-964.35kJ//mol`D. None of these |
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Answer» Correct Answer - B `Delta_(r)G^(@)=Delta_(r)H^(@)-TxxDelta_(r)S^(@)` `Delta_(r)S^(@)=2xx81-4xx24-3xx205J//mol` `therefore" "Delta_(r)H^(@)=-2258.1 kJ//mol` `Delta_(r)H^(@)=2xxDelta_(f)H^(@)(Cr_(2)O_(3),s)` `thereforeDelta_(f)H^(@)(Cr_(2)O_(3),s)=-(2258.1)/(2)` `=-1129.05"kJ/mol"` |
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