Molecular formula of Naproxen: -- C14H14O3
From Molecular Formula you can calculate very easily.
Part A.) In 2.05 mole of naproxen moles of Naproxen present =
14 x 2.05 = 28.7 mole
Part B.) In 0.432 mole of naproxen, mole sof hydrogen present =
0.432 x 14 = 6.048 mole
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