Question

which of the following statements is correct regarding avogadro’s number?
avogadro’s number is the number of moles in 6.02 x 10^23 grams of a substance.
avogadro’s number is the amu in one mole of a substance.
avogadro’s number is the number of co2 molecules in one mole of co2.
avogadro’s is the number of grams in one mole of a substance.
avogadro’s number is equal to the number of ch4 molecules in one gram of ch4.

Explanation:

• Option 1: Avogadro’s number is about particles (atoms, molecules, etc.) in a mole, not moles in a mass. So this is wrong.
• Option 2: AMU (atomic mass unit) and moles are different. 1 mole is about \(6.02\times10^{23}\) particles, not related to AMU in this way. Wrong.
• Option 3: One mole of any substance (like \(CO_2\)) has Avogadro’s number (\(6.02\times10^{23}\)) of its molecules. This matches the definition. Correct.
• Option 4: Avogadro’s number is about particles in a mole, not grams. The molar mass (grams per mole) varies by substance. Wrong.
• Option 5: Avogadro’s number is the number of \(CH_4\) molecules in one mole of \(CH_4\), not one gram. Wrong.

Answer:

C. Avogadro’s number is the number of \(CO_2\) molecules in one mole of \(CO_2\) (assuming the third option is labeled C; adjust label as per original, but the correct statement is that Avogadro’s number is the number of particles (molecules here for \(CO_2\)) in one mole of a substance).