A sample of ethanol C2H5OH, contains 3.5 x 10^23 hydrogen atoms. How many C2H5OH molecules are in this sample?

Answer 1

easy. You see that a molecule of ethanol has 6 atoms hydrogen

so 3.5 10^23 has (3.5 10^23)/6 = 5.83 10^22 molecules

Answer 2

First, you should know molecular mass of CaCl2:

M (CaCl2) = 111 g/mol

We can compute # of moles of CaCl2:

n(CaCl2) = mass(CaCl2) / M(CaCl2) =
n(CaCl2) = 6.45 g / 111 g/mol = 0.058 moles

Using the Avogadro number (6.02 x 10^23 molecules/mol) we can know the number of molecules in 6.45 g of CaCl2:

# of molecules CaCl2 = 6.02 x10^23 x 0.058 moles =
= 3.5 x 10^22 molecules


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