A sample of an unknown pure substance X is analyzed and found to contain 7.47 g of Element E, 8.53 g of Element Ey, and no other elements. A similar analysis is made of three other substances that also only contain Elements E1 and E2. The results are shown in the table below. Decide whether each of the other substances is also a pure substance. If you don't have enough information to decide, choose can't decide. Substance Mass of E1 Mass of E2 Pure substanceA 21.0 g 6.0 g pure substance Mixture Can't decide B 13.8 g 18.2 g pure substance Mixture Can't decide C 19.6g 19.4 g pure substance Mixture Can't decide