A powder contains FeSO4.7H20 (molar mass = 278.01 g/mol), among other components. A 3.350 g sample of the powder was dissolved in HNO, and heated to convert all iron to Fe3+. The addition of NH, precipitated Fe, Oz xH, O, which was
subsequently ignited to produce 0.321 g Fe, Oz.
What was the mass of FeSO4.7H2O in the 3.350 g sample?
mass of FeSO4.7H, O:
g
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Achemist 16 drop copper metal from copper chloride solution. the chemist place is 0.50 g of aluminum foil in a solution containing 0.75 g of copper (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction?

You just calculated that the heat of fusion for chloromethane is 6400 j/mol. the heat of fusion for hydrogen is 120 j/mol.? which of the following account for this difference? more than one correcta. chloromethane can absorb more energy at the same temperature. b. hydrogen has stronger intermolecular forces than chloromethane. c. hydrogen molecules can pack more closely than chloromethane molecules. d. chloromethane experiences dipole-dipole interactions. e. chloromethane has a higher molar mass than hydrogen.

This statement about matter and its behavior is best classified as a