An aspirin tablet contains 75.0 mg of aspirin, which has the molecular formula, c9h8o4.

You can find 1) how many moles of aspirin are in the tablet, and 2) how many molecules of aspirin are in the tablet

1) Formula: number of moles = mass in grams / molar mass

Molar mass of C9H8O4:

9*12.0g/mol + 8*1.0 g/mol + 4*16.0g/mol = 180 g/mol

mass of aspirin = 75.0 mg = 0,075 g

=> number of moles of aspirin = 0,075 g / 180 g/mol = 0.0004167 moles

=> Answer 1) 0.000417 moles of aspirin

2) number of molecules = number of moles * Avogadro's number =>

number of molecules = 0,000417 moles * 6.022 * 10^23 molecules / moles =

= 2.51 * 10^20 molecules.

Answer 2: 2.51 * 10^20 molecules

30litre of li2o is 1.0002mole approximately 1 mole