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:

To determine the correct statement about Avogadro’s number, we analyze each option:

• First option: Avogadro’s number is not the number of moles in \(6.022 \times 10^{23}\) grams (molar mass, not moles, relates to grams).
• Second option: Avogadro’s number (\(6.022 \times 10^{23}\)) is the number of entities (atoms, molecules, ions) in one mole of a substance, not amu (atomic mass unit) count.
• Third option: One mole of any substance (e.g., \(\ce{CO2}\)) contains Avogadro’s number of its molecules. So “Avogadro’s number is the number of \(\ce{CO2}\) molecules in one mole of \(\ce{CO2}\)” is correct.
• Fourth option: Avogadro’s number is not the number of grams in one mole (molar mass is grams per mole, not Avogadro’s number).
• Fifth option: Avogadro’s number applies to one mole, not one gram, of a substance (e.g., \(\ce{CH4}\)).

Answer:

C. Avogadro’s number is the number of \(\ce{CO2}\) molecules in one mole of \(\ce{CO2}\) (Note: Assuming the third option is labeled "C" based on typical multiple - choice numbering; adjust the identifier if the original numbering differs, but the text of the option is as stated above).