posted by robyn .
How many grams of ibuprofen contain
7.1x10^25 atoms of C? Ibuprofen is C13H18O2. Molar Mass is 206. The answer is=1870 grams. How do I calculate this to get this answer? Please help!
7.1E25/6.02E23 = ? mols C atoms
?mols C atoms x (1 mol IBu/13 C atoms) x (206 g/mol) = ? and round. I would round to 1900 (1870 has four s.f. in it and you're allowed only 2 from the 7.1).