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There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics.
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10 0 - CaC(s) + 2 H₂O(gs C₂ H₂ (g) + Ca (OH),(s) DH; = -414 KI. @ -66H2(g) + 3C02(g) + 4H2O(g) → SCH, CHCOOH oli = 132kJ. for

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