How do I answer these?

Data:

Lab Data Not Worked Identity of Unknown Edit Answer Mass (g) of Unknown 0.52 Edit Mass (g) of filter paper 0.645 Edit 0.931 Mass (g) of filter paper + copper (1st heating) Edit Mass (g) of filter paper + copper (2nd heating) 0.931 Edit POST-LAB QUESTIONS 1. How would the calculated molar mass of your unknown be affected if the following errors were made? Be very clear in your reasoning. a. Some magnesium was filtered out with the precipitated copper. The calculated molar mass would be: NG 1 Explain the correct answer. NG 1 Edit Answer b. More acid was added than needed to dissolve the excess magnesium. The calculated molar mass would be: NG 1 Explain the correct answer. NG 1 Edit Answer c. The magnesium was fully dissolved but a bluish color persisted in the solution as it was filtered. The calculated molar mass would be: NG 1 Explain the correct answer. NG 1 Edit Answer d. Too much magnesium was added but it was all dissolved prior to filtering. The calculated molar mass would be: NG 1 Explain the correct answer. NG 1 Edit Answer 2. If the percent of copper in a compound is 89.4 %, what is the molar mass of the compound? Assume that there are 2 moles of copper per one mole of formula unit of the compound. NG 6 Info