5.77 | In the early days of automobiles, illumination at night was provided by burning acetylene

Описание

In the early days of automobiles, illumination at night was provided by burning acetylene, C2H2. Though no longer used as auto headlamps, acetylene is still used as a source of light by some cave explorers. The acetylene is (was) prepared in the lamp by the reaction of water with calcium carbide, CaC2:
CaC2(s) + 2H2O(l) ⟶ Ca(OH)2(s) + C2 H2(g).
Calculate the standard enthalpy of the reaction. The ΔH°f of CaC2 is −15.14 kcal/mol.

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