If a grain is equal to 64.8 mg, how many moles of aspirin (mol. wt. = 169) are present in 5.00 grain aspirin tablet?
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If a grain is equal to 64.8 mg, how many moles of aspirin (mol. wt. = 169) are present in 5.00 grain aspirin tablet?

If a grain is equal to 64.8 mg, how many moles of aspirin (mol. wt. = 169) are present in 5.00 grain aspirin tablet?
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If a grain is equal to 64.8 mg, how many moles of aspirin (mol. wt. = 169) are present in 5.00 grain aspirin tablet?

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SOLUTION : One grain weighs $64 \cdot 8 mg$

$\therefore 5 \cdot 0$ grains weigh $64 \cdot 8 \times 5 \times 10^{-3} g =0.324 g$

$\therefore$ No. of mole $=\frac{\text { mass }}{\text { mol. wt. }}=\frac{0.324}{169}$ mole. $= 0 \cdot 00192$ mole.

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