ΔH for the reaction
IF5 (g) → IF3 (g) + F2 (g)
is ________ kJ, give the data below.
IF (g) + F2 (g) → IF3 (g) ΔH = -390 kJ
IF (g) + 2F2 (g) → IF5 (g) ΔH = -745 kJ
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2016-11-04 12:56 am
回答 (1)
2016-11-04 1:27 am
Refer to the given data. The following two thermochemical equations can be written :
IF₅(g) → IF(g) + 2F₂(g) …. ΔH = -(-745) kJ = +745 kJ
IF(g) + F₂(g) → IF₃(g) …. ΔH = -390 kJ
Add the above two equations, and cancel IF(g) and F₂(g) on the both sides :
IF₅(g) → IF₃(g) + F₂(g) …. ΔH = (+745) + (-390) kJ = +355 kJ
IF₅(g) → IF(g) + 2F₂(g) …. ΔH = -(-745) kJ = +745 kJ
IF(g) + F₂(g) → IF₃(g) …. ΔH = -390 kJ
Add the above two equations, and cancel IF(g) and F₂(g) on the both sides :
IF₅(g) → IF₃(g) + F₂(g) …. ΔH = (+745) + (-390) kJ = +355 kJ
收錄日期: 2021-04-18 15:43:55
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