Respuesta :
Each alka-seltzer tablet contains 324 mg of aspirin. Three alka-seltzer tablet contains (3 x 324)mg= 972 mg of aspirin= 0.972 g of aspirin.
Molecular formula of aspirin is C₉H₈O₄. Molar mass of aspirin is (9 x 12)+(8 x 1)+(4 x 16) g/ mol= 180 g/mol.
180 g of aspirin contains 1 mole of aspirin molecules i.e, 6.023 X 10²³ number of aspirin molecules. So, three alka-seltzer tablet that is 0.972 g of aspirin contains (0.972 X 6.023 X 10²³)/180 =3.25 X 10²¹ number of aspirin molecules.
Answer:
Molecules of aspirin we are consuming is [tex]3.2679\times 10^{21} [/tex].
Explanation:
Mass of an aspirin in 1 alka-seltzer tablet = 324 mg = 0.324 g
Molar mass of an aspirin, [tex]C_9H_8O_4[/tex] = 180 g/mol
Moles of an aspirin in one tablet = [tex]\frac{0.324 g}{180 g/mol}=0.0018 mol[/tex]
Number of molecules in 0.0018 moles of an aspirin:
[tex]=0.0018 mol\times 6.022\times 10^{23} mol^{-1}[/tex]
[tex]=1.0839\times 10^{21} molecules[/tex]
Number of molecules in of aspirin in 1 tablet:[tex]1.0839\times 10^{21} molecules[/tex]
Number of molecules in of aspirin in 3 tablet:
[tex]=3\times 1.0839\times 10^{21} molecules[/tex]
[tex]=3.2679\times 10^{21} molecules[/tex]
