Owing to the intermolecular interactions of water molecules (in a pure water), the latent heat of freezing (fusion) is and the latent heat of melting is .

a) 1 cal/g and 10 cal/g

b) 40 cal/g and 540 cal/g

c) 80 cal/g and 80 cal/g

d) 40 cal/g and 80 cal/g

A3.37-mg sample of protein was chemically digested to convert its nitrogen into ammonia and then diluted to 100.0 ml. then 10.0 ml of this solution was placed in a 50-ml volumetric flask and treated with 5 ml of phenol solution plus 2 ml of sodium hypochlorite solution. the sample was diluted to 50.0 ml, and the absorbance at 625 nm was measured in a 1.00-cm cuvette and found to be 0.486. for reference, a standard solution was prepared from 10.0 mg of nh4cl (molar mass = 53.49 grams/mole) dissolved in 1.00 l of water. then 10.0 ml of this standard was placed in a 50-ml volumetric flask, treated in the same manner as the unknown, and the absorbance found to be 0.323. finally, a reagent blank was prepared using distilled water in place of unknown, it was treated in the same manner as the unknown, and the absorbance found to be 0.076. calculate the weight percent of nitrogen in the protein.

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

What is the molar mass of ca(cio4)2