Answer: 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.
Explanation:
An atom consists of two regions. The first is the tiny atomic nucleus, which is in the center of the atom and contains positively charged particles called protons and neutral, uncharged, particles called neutrons. ... Most atoms contain all three of these types of subatomic particles—protons, electrons, and neutrons.
Answer:
A change in speed hope this helps
AWNSER: 1.0 mol Fe2O3 contains 111.69 g Fe .