Help me solve this

Question

Convert 7.41 x10²⁴ atoms of krypton to mass (g)

Answer 1

Molar mass of Krypton: 83 798 grams/mole

#atoms in 1 mole: 6.022×10²³ atoms or Avogadro's number

Mass of 7.41×10²⁴ atoms:

(7.41×10²⁴/1)*(1 mole/6.022×10²³)*(83.798 grams/1mole) which is 1031 grams.

a) Divide the number of atoms by Avogadro's number in order to find the number of moles.

b) Multiply your answer from part a) by the molar mass in order to find the mass of the molar amount from part a).

Answer 2

For this problem you will need two things:

Avogadro's number = 6.022 x 10²³ amu/mol

Krypton's molar mass = 83.8 g/mol

Here's how you set up the problem:

7.41 x 10²⁴ atoms / 1 X 1 mol / 6.022 x 10²³ atoms X 83.8 g Krypton/ 1 mol

Calculate to get the answer ~ 1031 g of Kr.

The units should cancel out to give you your answer in grams.