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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
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 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
收錄日期: 2021-05-01 22:31:22
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