# What is the theoretical yield of acetylene when 2.38 g of calcium carbide reacts with excess water? What is the percentage yield if I obtained 0.77 g acetylene?

##### 1 Answer

The theoretical and percentage yields of acetylene are 0.967 g and 80 %, respectively.

#### Explanation:

We start with the balanced equation.

For convenience, I have written the molar masses above the formulas.

**(a) Calculate the moles of #"CaC"_2#**

**(b) Calculate moles of #"C"_2"H"_2# formed from the #"CaC"_2#**

**(c) Calculate the theoretical yield of #"C"_2"H"_2#**

The theoretical yield of product is 0.967 g.

**(d) Calculate the percentage yield of #"C"_2"H"_2#**

The formula for percentage yield is

#color(blue)(bar(ul(|color(white)(a/a)"Percentage yield" = "actual yield"/"theoretical yield" × 100 %color(white)(a/a)|)))" "#

The percentage yield is 80 %.