Consider a process in which two gamma-ray photons are released when an electron and a positron are annihilated. [note that the mass of a positron is equal to that of an electron, and the gamma-ray photon has no mass.]
(a) what is the final energy of each photon (in j units)?
(b) what is the final energy of each photon (in kj/mol units)?
(c) what is the final energy of each photon (in ev units)?

Steam reforming of methane ( ch4) produces "synthesis gas," a mixture of carbon monoxide gas and hydrogen gas, which is the starting point for many important industrial chemical syntheses. an industrial chemist studying this reaction fills a 1.5 l flask with 3.5 atm of methane gas and 1.3 atm of water vapor at 43.0°c. he then raises the temperature, and when the mixture has come to equilibrium measures the partial pressure of carbon monoxide gas to be 1 .0 atm. calculate the pressure equilibrium constant for the steam reforming of methane at the final temperature of the mixture. round your answer to 2 significant digits.