Final answer:
A sample of krypton has a greater mass than a sample of neon if both samples have the same number of moles, because krypton has a higher atomic mass (and thus a higher molar mass) than neon.
Step-by-step explanation:
If a sample of krypton has the same number of moles as a sample of neon, to determine which sample has the greater mass, we need to look at their atomic masses since the number of moles is the same.
The sample with the heavier atomic mass will have the greater mass. By referring to the periodic table, we find that the atomic mass of neon is about 20.18 amu and the atomic mass of krypton is about 83.80 amu.
Therefore, one mole of krypton atoms is significantly heavier than one mole of neon atoms.
Since molar mass is the mass of one mole of a substance, we can calculate the mass of our samples using the formula:
mass (g) = number of moles × molar mass (g/mol)
Given that both samples have the same number of moles, the sample with the greater molar mass (krypton in this case) will have the greater mass when compared to the sample of neon.