The standard enthalpy change for following reaction is 186 kJ at 298K. CaH2s ->Cas + H2g What is the standard heat of formation of CaH2(s)?

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2019-03-22 8:29 am

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The standard enthalpy change for the following reaction is 186 kJ at 298 K. CaH2(s) Ca(s) + H2(g) What is the standard heat of formation of CaH2(s)? ____ kJ/mol

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胡雪8°

2019-03-22 9:33 am

✔ 最佳答案

The given thermochemical equation:
CaH₂(s) → Ca(s) + H₂(g) …… ΔH° = 186 kJ

Reverse the given thermochemical equation:
S Ca(s) + H₂(g) → CaH₂(s) ……ΔH° = -186 kJ

The above equation represents that of the standard enthalpy heat of formation of CaH₂(s).
Hence, ΔHf°[CaH₂(s)] = -186 kJ/mol

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