6. Among the substances that react with oxygen and that have been considered as potential rocket fuels are diborane Bho, produces B2O3(s) and H2O(g)], methane (CH4, produces CO2(g) and H2O(g)], and
hydrazine N2H4, produces N2(g) and H2O(g)]. On the basis of the heat released by 1.00 g of each
substance in its reaction with oxygen, which of these compounds offers the best possibility as a rocket fuel?
The AH; of B2H6(g), CH4(g), and N2H4(1) may be found in Appendix G.

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?