The number of molecules of aspirin is [tex]4.01\times 10^{20} molecules[/tex]
Given:
120. mg of the aspirin
To find:
The molecules of aspirin in 120. mg of aspirin.
Solution
Mass of aspirin = 120. mg
[tex]1mg = 0.001 g\\\\120. mg=120.\times 0.001 g=0.120 g[/tex]
Molar mass of aspirin = 180.158 g/mol
Moles of aspirin =[tex]= \frac{0.120 g}{180.158 g/mol}=0.000666 mol[/tex]
According to the mole concept:
[tex]1 mole = N_A=6.022\times 10^{23} atoms/molecule/ions[/tex]
The molecules of aspirin in 0.000666 moles of aspirin:
[tex]=0.000666\times 6.022\times 10^{23} molecules\\\\=4.01\times 10^{20} molecules[/tex]
The number of molecules of aspirin is [tex]4.01\times 10^{20} molecules[/tex].
Learn more about the mole concept here:
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