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what can be said about a reaction with h = 620 kj/mol and s = -0.46 kj/(molk)?

a. it is spontaneous above 1347 k.
b. it is always spontaneous.
c. it is spontaneous at 298 k.
d. it is never spontaneous.

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.

the ratio of the conjugate base to the acid required to attain the desired ph.

the answer is a! (2.9 x 10^-18 j) hope i could someone. : )