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The standard molar formation enthalpies of (A＋ )2Cd2(SO4)3[A＋ is NH＋ 4 or K＋ ] are determined from the enthalpies of dissolution (Δ SHm) of [(A＋ )2SO4(s)＋ 2CdSO4(s)] and (A＋ )2Cd2(SO4)3(s) in twice distilled water or 3 mol· L－ 1 HNO3 solvent respecti