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i cant figure out part A and B Find the mass of urea (CH4N2O) needed to prepare 49.9g of a solution in water in which

i cant figure out part A and B
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Find the mass of urea (CH4N2O) needed to prepare 49.9g of a solution in water in which the mole fraction of urea is 7.80102. Express your answer with the appropriate units. X Incorrect; Try Again; One attempt remaining Review your calculations and make sure you round to 3 significant flgures in the last step. MiSSED THiS? Read Section 14.6 (Pgges. 601-613); Watch kCV 14.6. What is the molar mass of the protein? A solution containing 28.30mg of an unknown protein per 30.0mL of solution was found to have an osmotie pressure ot 3.96 tort at 26C. x Incorrect; Try Again; 2 attempts remaining

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