The molecular formula of acetylsalicylic acid is C9H8O4. How many molecules of C9H8O4 are in a 750.0mg tablet of asprin?

To determine the number of molecules of acetylsalicylic acid (C9H8O4) in a 750.0 mg tablet of aspirin, we need to use the Avogadro's number and convert the given mass into moles.

1. Calculate the molar mass of acetylsalicylic acid (C9H8O4):
- Carbon (C) has a molar mass of 12.01 g/mol, and there are 9 carbon atoms in acetylsalicylic acid (9 * 12.01 g/mol = 108.09 g/mol).
- Hydrogen (H) has a molar mass of 1.008 g/mol, and there are 8 hydrogen atoms in acetylsalicylic acid (8 * 1.008 g/mol = 8.064 g/mol).
- Oxygen (O) has a molar mass of 16.00 g/mol, and there are 4 oxygen atoms in acetylsalicylic acid (4 * 16.00 g/mol = 64.00 g/mol).
- Therefore, the molar mass of acetylsalicylic acid is 108.09 g/mol + 8.064 g/mol + 64.00 g/mol = 180.154 g/mol.

2. Convert the mass of the tablet into moles:
- Given mass of the tablet = 750.0 mg = 0.750 g.
- To convert grams to moles, divide the given mass by the molar mass:
Moles (n) = Mass (g) / Molar mass (g/mol)
n = 0.750 g / 180.154 g/mol = 0.00416 mol.

3. Use Avogadro's number to calculate the number of molecules:
- Avogadro's number (NA) is 6.022 x 10^23 molecules/mol.
- Number of molecules = Moles (n) * Avogadro's number (NA)
Number of molecules = 0.00416 mol * 6.022 x 10^23 molecules/mol ≈ 2.507 x 10^21 molecules.

Therefore, there are approximately 2.507 x 10^21 molecules of acetylsalicylic acid (C9H8O4) in a 750.0 mg tablet of aspirin.

To determine the number of molecules of C9H8O4 in a 750.0mg tablet of aspirin (acetylsalicylic acid), you would need to use the Avogadro's number to convert the mass of the tablet into moles, and then calculate the number of molecules.

1. Convert the mass of the tablet from milligrams (mg) to grams (g):
750.0 mg = 750.0 / 1000 = 0.75 g

2. Calculate the number of moles by dividing the mass in grams by the molar mass of C9H8O4. The molar mass of acetylsalicylic acid can be determined by adding up the atomic masses of all the atoms in the molecule.
Molar mass of C9H8O4 = (9*12.01) + (8*1.01) + (4*16.00) = 180.16 g/mol

Number of moles = Mass in grams / Molar mass
Number of moles = 0.75 g / 180.16 g/mol = 0.004165 mol

3. Use Avogadro's number to convert moles to molecules.
Avogadro's number (NA) = 6.022 × 10^23 molecules/mol

Number of molecules = Number of moles * Avogadro's number
Number of molecules = 0.004165 mol * 6.022 × 10^23 molecules/mol

Calculating the above expression will give you the answer to your question, which is the number of molecules of C9H8O4 in a 750.0mg tablet of aspirin.

First, let me point out that a 750 mg tablet of aspirin has ASA in it BUT it also contains a binder and some inert ingredients. I assume the 750 mg is all acetylsalicylic acid.

How many mols are there?
0.750 g/molar mass ASA.
Then remember there are 6.02 x 10^23 molecules in a mole.