Question

How many moles are in 5.4 x 1024 molecules of NaBr?

O 3 moles
O 18 moles
O 9 moles
O 15 moles

Answer 1

9 moles is correct

Step-by-step explanation:

Using Avogadro's constant for the definition of a mole: 6.022 × 10²³ of anything:

Number of moles = number of things (molecules) / Avogadro's constant

moles = 5.4×10²⁴ ÷ 6.022×10²³ = 8.967... ≈ 9 moles