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2Ca(s) + O2(g)⇒2CaO(s) ΔH = -1269 kj
CaO(s) + H2O(I)⇒Ca(OH)2(s) ΔH = -571 kj
reaksi pembentukan Ca(OH)2 :
Ca + H2 + O2 ----> Ca(OH)2
reaksi pertama : dibagi 2
reaksi kedua : dibagi 2
reaksi ketiga : tetap
H2(g) + 1/2 O2(g)⇒ H2O(I) ΔH = -285,5 kj
Ca(s) + 1/2 O2(g)⇒ CaO(s) ΔH = -634,5kj
CaO(s) + H2O(I)⇒Ca(OH)2(s) ΔH = -571 kj
-------------------------------------------------------------------- +
Ca + H2 + O2 ----> Ca(OH)2 delta H = - 1491 kJ
semoga membantu :)
semoangat belajar ya :)