Consider the following reaction: 2 A (aq) + B (aq) ⇌ C (aq) + D (aq)
If the Kc for this equilibrium reaction is 44.9, and the equilibrium concentrations of A, B, and C are: [A] = 0.772 M, [B] = 0.0339 M, and [C] = 2.15 M, what is the equilibrium concentration (in M) of D?

answer; /// i do believe that the correct answer is (a) boiling

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

c) should be the answer.