Question

What is the mass of `4.22 x10^23` atoms of lead (Pb)?

Answer 1

145 g of Pb

Explanation:

`(4.22 x 10^23)/ (6.022 x10^23)= .7008 mol Pb`
`.7008mol Pb (207.2 g/(mol))`=145.198
The answer is significant to three digits so rounded this would be 145 g Pb

We divide by Avogadro's number in the first step since per mole there are `6.022x10^23` atoms then from mols use the molar mass of lead to find how many grams of lead