The source of bitterness in dark chocolate is the compound theobromine, an alkaloid present in cocoa beans. in a sample of dark chocolate there are 6.45 × 10 20 molecules of theobromine present. how many milligrams of theobromine are present in the sample? the molecular formula for theobromine is c 7 h 8 n 4 o 2 .

193 mg of theobromine are present in the sample.

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number of particles.

To calculate the moles, we use the equation:

1 mole of theobromine weigh = 180 g

 of theobromine weigh =   (1g=1000mg)

193 mg of theobromine are present in the sample.