(40 points)

it takes 1 minute for a certain amount of potassium phosphate (kh2po4) to dissolve in 100 grams of water at 50 °c.

which of the following will most likely happen if the same sample of potassium phosphate is dissolved in 100 grams of water at 20 °c?
the sample will dissolve in exactly 1 minute.
the sample will dissolve in more than 1 minute.
the collision between particles of the sample will increase.
the collision between particles of the sample will remain constant.

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.

When the speed of the bottle is 2 m/s, the average maximum height of the beanbag is m.

Acompound has a molecular weight of 12.124 atomic mass units and the empirical formula c3h40. what is the molecular formula of the compound?