Acetylene Gas, HCCH(g), Can Be Generated in the Laboratory by Adding

Short Answer

Acetylene gas, HCCH(g), can be generated in the laboratory by adding calcium carbide to excess water, as shown in the following reaction
CaC₂(s)+ H₂O(l) $\rarr$ HCCH(g)+ CaO(s)
How many grams of CaC₂ would be required to generate 0.20 moles of HCCH(g)?