[ Chemistry ] Open Question : Homework Help?

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Stuck on these two questions. Would really like to learn how to do them so if anyone could explain how to do each problem I would really appreciate it. Thank you!

2. What is the boiling-point change for a solution containing 0.723 mol naphthalalene (a nonvolatile, nonionizing compound) in 250. g of liquid benzene? (K=2.53 C/m for benzene)

3. What is the molar mass of an aromatic hydrocarbon if 0.75 g of the compound depresses the freezing point of 123 g of benzene by 0.28C? (K for benzene is 5.12 C/m)

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