Calculate the number of moles of h2 gas collected over water that filled a graduated cylinder with 75.2 ml of gas at a temp perature of 19c and an atmospheric pressure of 749 torr. the vapor pressure of water at 19c = 16.48 torr. r = 62.363
i got .00309 mol h2, but missed one point on this question. not sure what i did wrong. will someone me step by step, ? you so much.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

c is the answer because when something is left after something evaporates that shows the chemical change.