Which element contains the greatest number of moles?

Explanation

To find the number of moles, we use the formula: moles = mass / molar mass. The molar mass is the atomic mass of the element in grams per mole.

For Helium (He): molar mass = 4 g/mol, so moles = 4 / 4 = 1 mole.

For Carbon (C): molar mass = 12 g/mol, so moles = 46 / 12 = 3.83 moles.

For Potassium (K): molar mass = 39 g/mol, so moles = 78 / 39 = 2 moles.

For Zinc (Zn): molar mass = 65 g/mol, so moles = 130 / 65 = 2 moles.

Comparing the results: 1, 3.83, 2, and 2 moles. Carbon gives the greatest number of moles (3.83) because its molar mass is very small compared to the given mass. A lighter element needs less mass to make one mole, so the same large mass gives more moles.