How many molecules of aspirin (formula mass aspirin = 180 amu) are in a 0.250-gram sample?

1 Answer
anor277
May 15, 2018

Take the quotient...#"mass"/"molar mass"#...and,,,,

Explanation:

And so, for C_9H_8O_4 we gots a molecular mass of 180.16*g*mol^-1...

And so "moles of aspirin"=(0.250*g)/(180.16*g*mol^-1)=0.001388*mol

And to get the number of molecules we simply multiply this molar quantity by the "Avocado number"....

0.001388*molxx6.02214xx10^23*mol^-1=8.36xx10^20 individual aspirin molecules....

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