A) if the equilibrium concentration in the reaction 2no2 ⇌ n2o4 finds [n2o4]= 2.9x10-3 and [no2]= 4.2x10-3 find the equilibrium constant, k.
b) given k, if 0.100 m of no2 reacts, what will be the concentraitions when the reaction gets to equilibrium?
c) if to the equilibrium, from previous, we add 0.0500 m n2o4, calculate the equilibrium concentraitions. which direction did the reaction shift?

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.

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.

Select the word from the list that best fits the definition the nuclear family into which a person is born or adopted.