Answer: 0.5 moles
Explanation:
Based on Avogadro's law:
1 mole of any substance has 6.02 x 10^23 molecules
So, 1 mole of caffeine = 6.02 x 10^23 molecules
Z moles = 3x10^23 molecules
To get the value of Z, cross multiply:
(3 x 10^23 molecules x 1mole) = (6.02 x 10^23 molecules x Z moles)
3 x 10^23 = (6.02 x 10^23 x Z)
Z = (3 x 10^23) ➗ (6.02 x 10^23)
Z = 0.498 moles
[Round 0.498 moles to the nearest tenth as 0.5 moles]
Thus, there are approximately 0.5 moles of caffeine
