00:01
To determine the molecular formula of the compound, we first need to determine the empirical formula.
00:06
To determine the empirical formula, recognizing it only contains carbon and hydrogen, we can determine the moles of carbon that are present from carbon dioxide.
00:15
We'll convert the grams carbon dioxide into moles by dividing by its smaller mass, and then go from moles carbon dioxide to moles carbon, recognizing there's one mole carbon and carbon dioxide.
00:27
We'll perform a similar calculation with hydrogen.
00:31
Taking the 3 .17 grams, sorry, 3 .17 grams water, dividing it by the molar mass of water to get moles water, and then converting moles water into moles hydrogen, recognizing there are two moles hydrogen for every mole of water.
00:47
And we get 0 .1747 moles carbon for every 0 .3515 or 19 moles of hydrogen.
00:56
These are not whole numbers...