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There are 0.100 x 6.022 x 10^23 = 6.022 x 10^22 hydrogen atoms in 0.100 mole of ibuprofen.
C13H18O2 500 mg ibuprofen (1 gram/1000 mg)(1 mole ibuprofen/206.274 grams)(13 mole C/1 mole ibuprofen)(6.022 X 10^23/1 mole C) = 1.90 X 10^22 atoms of carbon in that mass ibuprofen
There are 16 hydrogen atoms in 1 mole of C7H16.
0.0602 mole K x 6.02x10^23 atoms/mole = 3.62x10^22 atoms
0.0384 moles K x 6.02x10^23 atoms/mole = 2.31x10^22 atoms
The number of atoms is 1,50553521.10e23.