How many moles of nitrogen are in 5.0×10−2 mole of quinine?
Here is a link for quinine. It appears there are two N atoms in one mole quinine.
http://en.wikipedia.org/wiki/Quinine
So 0.05 mole quinine will contains twice that number of moles of N ATOMS. It will contain 0.05 moles N2 MOLECULES but I don't think that is the question..
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To find the number of moles of nitrogen in a given amount of quinine, we need to know the molar ratio of nitrogen to quinine.
The formula for quinine is C20H24N2O2, which means there are two nitrogen atoms (N) in one molecule of quinine.
Since there are 5.0×10−2 moles of quinine, we can use the molar ratio to calculate the number of moles of nitrogen.
Moles of nitrogen = 2 * Moles of quinine
Moles of nitrogen = 2 * 5.0×10−2
Moles of nitrogen = 0.1
Therefore, there are 0.1 moles of nitrogen in 5.0×10−2 mole of quinine.