Answer:
A. Theoretical yield of HCN is 1.33g
B. Percentage yield of HCN is 22.6%
Explanation:
The balanced equation for the reaction. This is given below:
KCN + HCl -> KCl + HCN
Determination of the molar mass of of KCN and HCN. This is illustrated below:
Molar Mass of KCN = 39 + 12 + 14 = 65g/mol
Molar Mass of HCN = 1 + 12 + 14 = 27g/mol
A. Determination of theoretical yield of HCN. This is illustrated below:
From the balanced equation above,
65g of KCN reacted to produce 27g of HCN.
Therefore, 3.2g of KCN will react to produce = (3.2 x 27)/65 = 1.33g of HCN.
Therefore, the theoretical yield of HCN is 1.33g
B. Determination of the percentage yield of HCN. This is illustrated below:
Theoretical yield of HCN = 1.33g
Actual yield of HCN = 0.30
Percentage yield of HCN =.?
Percentage yield = Actual yield /Theoretical yield x 100
Percentage yield = 0.30/1.33 x 100
Percentage yield of HCN = 22.6%
