How many grams are in 4.28 x 10^2 atoms of Ca?

Calculating the Mass of 4.28 x 10^2 atoms of Ca

To calculate the mass of 4.28 x 10^2 atoms of Ca in grams, we can use the formula:

Mass = (Number of atoms x Atomic mass of Ca) / Avogadro's number

Given data:

Number of atoms = 4.28 x 10^2

Atomic mass of Ca = 40.08 grams

Avogadro's number = 6.02 x 10^23 atoms/mol

Substitute the values into the formula:

Mass = (4.28 x 10^2 x 40.08) / 6.02 x 10^23

Mass = 171.624 / 6.02 x 10^23

Mass ≈ 2.85 grams

Hence, the mass of 4.28 x 10^2 atoms of Ca is approximately 2.85 grams.