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Verified answer
H1=h2 + h3Ca + H2 + O2 => CaO + H2O = -920
CaO + H2O => Ca(OH)2 = -66
Ca + H2 + O2 => Ca(OH)2 = -986
Ca + H₂ + O₂ → CaO + H₂O ΔH = -920
CaO + H₂O → Ca(OH)₂ ΔH = -66
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Ca + H₂ + O₂ → Ca(OH)₂ ΔH = -986