Question

Ibuprofen is an anti-inflammatory with the formula C13H18O2. How many moles of ibuprofen contain 1.04×1023 atoms of carbon? Express your answer using three significant figures.

Answer 1

• 1 molecule of ibuprofen contains (C13H18O2) 13 carbon atoms.
• 1 mole of ibuprofen contains 13 moles of carbon atoms.

1.04×10²³ atoms of carbon are contained in 1.04×10²³ X 1/13 molecules of ibuprofen

6.02 x 10²³ molecules of  ibuprofen.= 1 mole of  ibuprofen

1.04×10²³ X 1/13 molecules of ibuprofen = ? moles of  ibuprofen.

= 1.04×10²³ X 1/13 x 6.02 x 10²³

= 0.013289 moles of ibuprofen

so the given 1.04×10²³ number of carbon atoms are in 0.013289 moles of ibuprofen