Chemistry Help.?

Posted on 2015-11-19 07:06:00 in Chemistry by KELSEY

Hello I need a little bit of help with chem I've tried answering these questions however I am getting the wrong answers if someone could tell me how to do these questions step by step with answers it would be greatly appreciated.

Question 1:
To two significant figures, what is the freezing point of t-butanol in celsius?

Question 2:
Naphthalene is a polar solvent.

Question 3:
What is the molality of a solution prepared by dissolving 70.9 g of ethylene glycol, HOCH2CH2OH, in 1.29 L of water? Assume the density of water is 1.00 g/ml.

Question 4:
0.17 grams of benzene (C6H6) is dissolved into 4.7 grams of melted biphenyl. The freezing point of the mixture was determined to be 4.2 degrees below the freezing point of pure biphenyl. Based on these results, what is the Kf of biphenyl?

(Use the standard units in your calculation, oC/m, but do not include the units in your answer. Also note these are experimental values so they may not equal the literature value for Kf).

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