Question

Consider the formula for quinine C20 H24 N2 O2

How many moles of nitrogen are in 8.0×10−2 mole of quinine?

Answer 1

1 mole of quinine has mass of 324g

and $8 \times10^{-2} moles$ has mass of 25.92 grams

324 g consist of 28grams of nitrogen

25.92 g of quinine consist 2.24 grams of nitrogen

Moles of nitrogen = 2.24/14 = 0.16 moles