Impurities in the substance can cause a greater percent yield.
I recommend redoing the lab for better results.
its 2% JK Why would iknow sryyy
It is: 33 and 1/3 percent
18 is 9 over 50 as a percent.
39 over 50 as a percent is 78%
4 over 9 as a percent is 44.4444%