How many grams of nicotine (C10H14N2) contains 28.0 g of N?

1 mol of nicotine contains 28g nitrogen. This is because the molar mass of nitrogen is 14, so 2moles of nitrogen weigh 28 grams because moles = mass / molar mass
Since nicotine has 2 atoms of nitrogen per mol, 1 mol of nicotine contains 2 mol of nitrogen
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