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If 1 grain is equal to 64.8mg, how many ...

If 1 grain is equal to 64.8mg, how many moes of aspirin (mol. Wt. =169) are present in a 5 grain aspirin tablet?

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Mass of aspirin in the tablet =`64.8xx5=324mg`
=0.324g
Number of moles `=("Mass")/("Molar mass")=(0.324)/(169)`
`=1.92xx10^(-3)`
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