Caffeine has a molecular weight of 194 .it contains 28.9 percent by mass of Nitrogen .find the number of atoms of Nitrogen in 1 molecule of it

Question

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Answer 1

194 g/mole x 0.289 = 56.066 g nitrogen (N)

56.066 g N x 1 mole N/14.007 g = 4.00 moles N

Thus, there are 4 moles of N per mole of caffeine or 4 atoms of N in 1 molecule of caffeine.