An average cup of coffee contains about 125 mg of caffeine, \(C_{8} H_{10} N_{4} O_{2}\). How many moles of caffeine are in a cup, and how many molecules of caffeine?
Answer:
Enough caffeine to keep you up at night?
Explanation:
The molecular mass of caffeine is \(194.19 \mathrm{~g} \cdot \mathrm{mol}^{-1}\).
Moles of caffeine in a cup = \(\frac{125 \times 10^{-3} g}{194.19 \cdot g \cdot m o l^{-1}}=? ? m o l\)
The above calculation gives an answer in moles. This is simply a number, i.e.