At a certain temperature, the equilibrium constant, kc, for this reaction is 53.3. at this temperature, 0.300 mol of h2 and 0.300 mol of i2 were placed in a 1.00l container to react. what concentration of h2 is present at equilibrium.

Modern physics a photon emitted from an excited hydrogen atom has an energy of 3.02 electron volts. which electron energy-level transition would produce this photon? a. n=1 to n=6 b. n=2 to n=6 c. n=6 to n=1 d. n=6 to n=2 i chose b but the correct answer is d can someone tell me why? and what's the difference?