Question

Regular treatment with low dose aspirin is used to help prevent cardiovascular disease. How many aspirin molecules are in

Answer 1

The number of molecules of aspirin is $4.01\times 10^{20} molecules$

Given:

120. mg of the aspirin

To find:

The molecules of aspirin in 120. mg of aspirin.

Solution

Mass of aspirin = 120. mg

$1mg = 0.001 g\\\\120. mg=120.\times 0.001 g=0.120 g$

Molar mass of aspirin = 180.158 g/mol

Moles of aspirin =$= \frac{0.120 g}{180.158 g/mol}=0.000666 mol$

According to the mole concept:

$1 mole = N_A=6.022\times 10^{23} atoms/molecule/ions$

The molecules of aspirin in 0.000666 moles of aspirin:

$=0.000666\times 6.022\times 10^{23} molecules\\\\=4.01\times 10^{20} molecules$

The number of molecules of aspirin is $4.01\times 10^{20} molecules$.

Learn more about the mole concept here:

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