A typical cup of coffee contains 75 mg of caffeine per 200.0 mL of water. If the density of the solution were approximately 1.09 g/mL, what would you calculate as the mass percent caffeine?

Question

anonymous · Answer

multiply the volume by the density to get the weight of the coffee. Then divide .075 by that number and multiply by 100 to get the percentage. If you do the math and write the number I'll compare it with what I get.