45.9 gram sample of borane (a compound containing only boron and hydrogen) that's 85.63% boron. What's the mass of hydrogen in this sample?
I was just going to take 45.9 grams and multiply by .1437 to get the mass of hydrogen but I don't think it works that way because they don't equally contribute to the mass of the compound? So then I thought, maybe I should consider the molar masses of both atoms, hydrogen being 1.008g and boron being 10.811g. I am stuck at this point, please help.