s) + 2H2O(1)→C¿H2(g) + Ca(OH)2(aq) roduct gas, C2H2, is collected over water at a temperature of 20 °C and a pressure of 745 mm Hg. If the wet C,H2 gas formed occupies a vol BL, the number of moles of CaC, reacted was mol. The vapor pressure of water is 17.5 mm Hg at 20 °C.

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