Find theoretical mass of Ca(OH)2:
"n(CaC_2) = \\frac{m}{M} = \\frac{4.56}{64.099}=0.07114 mol"
"n(Ca(OH)_2) = n(C_2H_2) = 0.07114 mol"
"m_{theor}(Ca(OH)_2) = n\\times M = 0.0714 \\times 74.093 = 5.271 g"
Find actual mass of Ca(OH)2:
"n(HCl )= c\\times V = 0.500 \\times 0.00255 = 0.001275 mol"
"n(Ca(OH)_2) = \\frac{n(HCl)}{2} = \\frac{0.001275}{2} = 0.0006375 mol"
"m_{actual} (Ca(OH)_2) = n\\times M = 0.0006375 \\times 74.093 = 0.04723 g"
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