Determining the percentage purity of a sample based solely on its melting point can be challenging, as impurities can cause the melting point to be lower than the pure substance. However, it is not possible to accurately quantify the percentage purity without additional information or experimental data.In this case, the melting point of the aspirin sample is 135C, which is at the lower end of the literature melting point range for pure aspirin 135-136C . This suggests that the sample may have some impurities, but without further analysis, it is not possible to provide an exact percentage purity.