A sample of table sugar (sucrose, C12h22O11) weighs 2.8mg?

Question

Calculate the total number of molecules in the sample? How many atoms are present in the 2.8 mg sample?

Answer 1

Calculate the molecular mass of the sucrose.

0.0028g / Mol. Mass = moles of sucrose
muliply by avogadro to get # of molecules.
There are 45 atoms in each molecule, so multiply accordingly

Answer 2

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