Which of the following is a true statement? A. If one mole of 39K has a mass of 39.1 grams, the mass of one atom of 39K is 39.1x10^-23 grams.
В. If one atom of 12C has a mass of 12.0 amu, one mole of 12C atoms has a mass of 12 x 6.02x10^23 grams.
C. If one atom of 223Fr has a mass of 223.0 amu, one mole of 223Fr has a mass of 223.0x10^23 amu.
D. If one atom of 1271 has a mass of 126.9 amu, one mole of 1271 has a mass of 126.9 grams.

Achemist at a pharmaceutical company is measuring equilibrium constants for reactions in which drug candidate molecules bind to a protein involved in cancer. the drug molecules bind the protein in a 1: 1 ratio to form a drug-protein complex. the protein concentration in aqueous solution at 25 ˚c is 1.74 x10-6 m . drug a is introduced into the protein solution at an initial concentration of 2.00 x10-6m. drug b is introduced into a separate, identical protein solution at an initial concentration of 2.00 x10-6m. at equilibrium, the drug a-protein solution has an a-protein complex concentration of 1.00 x10-6m, and the drug b solution has a b-protein complex concentration of 1.40 x10-6m. a. calculate the kc value for the a-protein binding reaction. b. calculate the kc value for the b-protein binding reaction. c. assuming that the drug that binds more strongly will be more effective, which drug is the better choice for further research?