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Problem: Write balanced equations for the formation of one mole of the following compounds from their elements and include _Hƒf.
(a) Silver chloride, AgCl, a solid at standard conditions.
(b) Calcium carbonate, CaCO3 , a solid at standard conditions.
(c) Hydrogen cyanide, HCN, a gas at standard conditions.
Skill 6-6. Writing formation equations and using DHƒf values to find DHƒrxn
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