In a different experiment, a student made a compound of sulfur and copper, and now she needs to find if the compound is cooperI sukfied or copper II sulfide. she cannot physically identify hte compound 1.0440gram sample of the compound contains 0.8383 grams of copper. What is the identity of the compund? (HINT: First determine the formulas of the two candidate compounds, and then the percent copper for each one.)