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Hydrogen Peroxide

If 1 grain is...

Question

If 1 grain is equal to 642 mg, how many moles of aspirin (mot wt. = 169 ) are present in a 5 grain aspirin tablet?

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Solution

Mass of aspirin in the tablet $= 648 \times 5 = 324 m g$
$= 0.324 g$
Mass Number of moles $= \frac{m a s s}{M o l a r m a s s} = \frac{0.324}{169}$
$= 1.92 \times 10^{- 3}$

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