Answer: "Even though one mole of sodium atoms, one mole of tin atoms, and one mole of sulfur atoms weigh different amounts, they all contain 6.022 x 10^23 atoms".
Explanation:
The question requires us complete the sentence with the common value for 1 mol of different substances.
The Avogadro's number tells us the amount of particles (ions, atoms, molecules etc.) contained in 1 mole of any substance. This number is a proportionality factor to relate the number of particles in a sample with the amount of substance in that sample.
According to the Avogadro's number, there are 6.022 x 10^23 particles in 1 mole of a substance.
Therefore, we can complete the sentence as:
"Even though one mole of sodium atoms, one mole of tin atoms, and one mole of sulfur atoms weigh different amounts, they all contain 6.022 x 10^23 atoms".toms,