What is the mass in grams of 0.0015 mol of aspirin, #C_9H_8O_4#,? How many aspirin molecules are there in this 0.0015 mol sample?

1 Answer
Mrs. Goldcamp · Stefan V.
Apr 5, 2016

#"116.1 g"# , #9.03 xx 10^20#molecules

Explanation:

Find the molar mass of aspirin, #C_9H_8O_4#,

#9(12) + 8(1) + 4(16) = "180 g/mol"#

#0.0015 cancel("moles") xx "180 g"/(1cancel("mole")). = "116.1 g"#

Use Avogadro's number #6.02 xx 10^23#

#0.0015 cancel("moles") xx (6.02 xx 10^23"molecules")/(1cancel("mole")) = 9.03 xx 10^20"molecules"#

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