Question

If you have 7.22 x 1023 atoms of chromium (Cr), how many moles of chromium do you

have?

O.98 moles Cr
O 1.62 moles Cr
O 1.36 moles Cr
O 1.19 moles Cr

Answer 1

Step-by-step explanation:

To calculate the number of moles of chromium, we need to use Avogadro's number, which is defined as the number of atoms in 12 grams of carbon-12. Avogadro's number is approximately 6.022 x 10^23 atoms per mole.

Given that we have 7.22 x 10^23 atoms of chromium, we can calculate the number of moles of chromium using the following formula:

moles of chromium = number of atoms of chromium / Avogadro's number

moles of chromium = 7.22 x 10^23 / 6.022 x 10^23

moles of chromium ≈ 1.20

Therefore, we have approximately 1.20 moles of chromium.

Answer 2

The correct answer is 1.19 moles Cr

Step-by-step explanation:

We can use Avogadro's number, which is 6.022 x 10^23 particles (atoms or molecules) per mole, to convert the given number of atoms to moles.

Number of moles = Number of atoms / Avogadro's number

Number of moles = 7.22 x 10^23 / 6.022 x 10^23

Number of moles = 1.199 moles (rounded to three significant figures)

Therefore, the number of moles of chromium is approximately 1.19 moles Cr.