Soalnya ada di foto, bantuin ya plis plis plis

h1=h2 + h3
Ca + H2 + O2 => CaO + H2O = -920
CaO + H2O => Ca(OH)2 = -66
Ca + H2 + O2 => Ca(OH)2 = -986

ΔH₁ = ΔH₂ + ΔH₃

Ca + H₂ + O₂ → CaO + H₂O    ΔH = -920
CaO + H₂O → Ca(OH)₂           ΔH = -66
------------------------------------------------------------------- +
Ca + H₂ + O₂ → Ca(OH)₂        ΔH = -986