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    heat evolved in the reaction of CaC2 with water

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    Calcium carbide (CaC2) reacts with water to form acetylene (C2H2), a gas used as a fuel in welding.
    CaC2 (s) + 2 H2O (l) ---> C2H2 (g) + Ca(OH)2 (s)
    Change in Heat (Delta H) = -128.0 kJ
    How many kilojoules of heat are evolved in the reaction of 3.5 kg CaC2 with 1.15 L H2O?

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    Solution Preview

    First find which one is the limiting reactant.
    3.5 kg CaC2 is 3500 g/ 64 g/mol = 54.6875 mol.
    1.15 L water is 1.15 kg, therefore, the moles of H2O is
    1150 g / 18 ...

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