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The document contains 3 chemistry problems: 1) It asks to calculate the mole fractions of CH2Cl2 and CH2Br2 in a vapor mixture given the amounts and vapor pressures of the pure substances. 2) It provides the mass percentages of C, H, and O in an unknown compound and asks to determine the empirical formula, molar mass, and molecular formula using data about freezing point depression. 3) It asks to determine the mass percentage of MgCl2 in a solid mixture given the osmotic pressure of a solution made from d

Author

Nguyễn Minh Anh

Language

EN