Answer:
0.3549
Explanation:
the percentage yield is the percentage of the product formed based on the theoretical yield.in this question the percentage yield and theoretical yield have been given all that's left is the actual yield.so you use the formula
percentage yield=theoretical yield/actual yield×100
83.4=0.296/ay×100
83.4ay/83.4=100×0.296/83.4
ay=0.3549
I hope this helps