Determine the freezing point of a 0.51 molal solution of benzoic acid in chloroform. chloroform has a freezing point of -63.5°c and a freezing point depression constant of 4.70°c•kg/mol. what is the freezing point of this solution? °c

Astudent is given a sample of a blue copper sulfate hydrate. he weighs the sample in a dry covered porcelain crucible and got a mass of 23.875 g for the crucible, lid, and sample. the mass of the empty crucible and lid was found earlier to be 22.652 g. he then heats the crucible to expel the water of hydration, keeping the crucible at red heat for 10 minutes with the lid slightly ajar. on colling, he finds the mass of crucible, lid, and contents to be 23.403 g. the sample was changed in the process to very light clue anhydrous cuso4. if there are again 100.0 g of hydrate, how many grams of cuso4 are in it? how many moles of cuso4? (hint: molar mass of cuso4 = 159.6 g / mole. what per cent of the hydrate is cuso4? you may convert the mass of cuso4 to moles.)

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?