1. Write an equation for the enthalpy change of formation of CaO(s)
2. With reference to the diagram, determine the enthalpy change of formation of CaO(s).
3. Write an equation for the enthalpy change of solution of calcium hydroxide.
4. With reference to the diagram, determine the enthalpy change of solution of calcium hydroxide.
5. Using the data given in the diagram, calculate the enthalpy change of the following reaction.

CaH2(s) + H2O(l) -> Ca(OH)2(s) + H2(g)

1. Ca(s) + 1/2 O2(g) -> CaO(s)
2. -635.9 KJ/mol
3. CaO + H2O -> Ca(OH)2
4. -635.9-285+1002.8 = +81.9 KJ/mol
5. 計法其實同上題一樣，自己試下計

KS2234 :1. Ca(s) + 1/2 O2(g) -> CaO(s)
2. -635.9 KJ/mol
3. CaO + H2O -> Ca(OH)2
4. -635.9-285+1002.8 = +81.9 KJ/mol
5. 計法其實同上題一樣，自己試下計

第4係點解?點解係reactant-product

smb :第4係點解?點解係reactant-product

sor, 無睇清楚
應該係 -1002.8+635.9+285 = -81.9 KJ/mol