What is the mass of Oxygen in 50.0mg of ATP and how many total atoms are there in 50.0mg of ATP?
formula for ATP is C10H16N5O13P3.
I did this question 2x but I'm not getting the right answers according to the book. I'm thinking the book is wrong....the book says the answers are 20.5mg and 2.79 x 10 to the 21 atoms respectively.
Mary, How's your studies coming along? I'm soo stressed, & trying to do a million things here at once, since game day is NEXT SAT the 23rd. I'm really sorry I don't have time to show you the exact calculations, but I'll give you a road map to get to the ans, & you can try calculating it out, & it should work. I looked at the question & wondered at first if you were talking about the percentage of oxygen, which would be the mass of the oxygen, 16(13) / the total molecular wgt of the compound x 100%. I'm not too sure if that's what you meant.
However, for the # of atoms, first convert the compound into moles, divide that 50 mg by the total molecular wgt, then mult it by the # of molecules, (6.022 x 10^23) since 1 mole is = to that number. Here's where things get a bit tricky, the number of atoms is found by counting up ONLY THE SUBSCRIPTS in the ATP formula: so its 10 + 16 + 5 + 13 + 3 = 47 atoms, so when you convert to molecules by multing by that 6.02 #, then you're going to mult it by the # of atoms, or 47 atoms to get the total # of atoms in the compound. Hope this helps, ok, back to achiever review for me, ::sighs::
