Question

Which of the following is NOT true about "yield"?
a.
The value of the actual yield must be given in order for the percent yield to be calculated.
b.
The percent yield is the ratio of the actual yield to the theoretical yield.
c.
The actual yield may be different from the theoretical yield because reactions do not always go to completion.
d.
The actual yield may be different from the theoretical yield because insufficient limiting reagent was used.

Answer 1

we need the actual yield to compute per cent yield

%yield = (actual yield/theoretical yield) x 100

and

reactions do not always go to completion or 100% for a number of reasons.