Question

How many moles of MgBr2 are 75.24g of MgBr2

Answer 1

0.409 mol

Step-by-step explanation:

The formula to find he number of moles is:

No. of moles =
`(mass)/(Mr)`

Mr of MgBr₂ = 24.3 + (79.9 × 2) = 184.1

Mass = 75.25g

So, no. of moles =
`(75.24)/(184.1)`

No. of moles = 0.409 mol [to 3 significant figures]