Answer:
198 mg
Explanation:
The number of molecules of theobromine can be related to a measurable quantity using Avogadro's constant, which is the the number of molecules in a mole.
6.62 x x10²⁰ molecules ÷ 6.022 x x 10²³ mol⁻¹ = 1.09930... x 10⁻³ mol
Moles can be related to grams using the molecular weight. The molecular weight of theobromine can be found by multiplying the number of each constituent atom by its respective atomic weight, then adding to obtain the molecular weight
7(12.01) + 8(1.01) + 4(14.01) + 2(16) = 180.19 g/mol
The moles of theobromine are converted to milligrams as follows:
1.09930 x 10⁻³ mol x 180.19 g/mol x 1000 mg/g = 198 mg
