(Relative atomic mass: H = 1, C = 12, N = 14,0 = 16, Na = 23, Cl = 35.5, K = 39, Fe = 56, Pb
= 207; Avogadro constant, N : 6.02 x 1023 mol-'; Molar volume = 22.4 dm' mol-1 at STP or
24 dm' mol-at room conditions)
1. Calculate the molar mass of each of the following substances:
(a) Lead metal, Pb
(c) Sodium nitrate, NaNO,
(b) Chloroform, CHCI,
(d) Iron(III) oxide, FeO,​

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.

Most materials are not magnetic because their magnetism has worn off. their magnetic domains are arranged randomly. they lack magnetic fields. earth’s heat has destroyed their magnetism.

Adilute aqueous potassium nitrate solution is