All change 3. Choose the best answer.
Perform the indicated calculation. You may use a calculator. Remember to round your answers according to the rules for significant figures.
25000 cm
x 500 cm
O 12,500,000 x 10 cm2
125.0 x 105 cm
O 12,500,000 cm?
O 0.00125 x 103 cm2
O 1 x 10 cm
4 Choose the best answer.
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The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

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.

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.