Question

Find the amount of molecules in 628.8g of KBr

Answer 1

3.18 x
`10^(24)` molecules

Step-by-step explanation:

Molecular mass of KBr : 39 + 80 = 119 g/mol

Moles : Mass

1 : 119

X : 628.8

X = 628.8/119

X = 5.28 moles

One of of a substance contains 6.022 x
`10^(23)` molecules.

Moles : Molecules

1 : 6.022 x
`10^(23)`

5.28 : X

X = 5.28 x (6.022 x
`10^(23)`)

X = 3.18 x
`10^(24)` molecules