On a given day, the water vapor in the air is 2.5%. If the partial pressure of the vapor is 19.4 mm Hg, what is the atmospheric pressure?

I know that Dalton's law needs to be used here, but I don't know where to start or how.

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a