Achemical equation can be used to solve stoichiometry problems provided that it
a. indicates only the forward reaction and not the reverse.
b. indicates that reactants are in the gas phase and are not solids or liquids.
c. includes the coefficients that are needed for balancing the equation.
d. includes the state of matter after each substance

the answer is a. co2, this would be colder than the : )

explanation:

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.