Question

Determine the number of moles in 4.50 × 10²³ formula units of CaBr₂

A) 0.75 moles
B) 1.50 moles
C) 3.00 moles
D) 4.50 moles

Answer 1

The number of moles in 4.50 × 10²³ formula units of CaBr₂ is 0.75 moles, calculated by dividing the number of formula units by Avogadro's number.

Step-by-step explanation:

To determine the number of moles in 4.50 × 10²³ formula units of CaBr₂, we first need to understand that one mole of a substance contains Avogadro's number of formula units, which is approximately 6.022 × 10²³ units.

Step 1: Calculate the number of moles based on the given number of formula units using Avogadro's number.

Moles of CaBr₂ = Number of formula units / Avogadro's number

Moles of CaBr₂ = (4.50 × 10²³ units) / (6.022 × 10²³ units/mol)

Moles of CaBr₂ = 0.75 mol

Therefore, the number of moles in 4.50 × 10²³ formula units of CaBr₂ is 0.75 moles, which corresponds to option A.