Question

Molecule- Mass Conversions
1. How many molecules are there in 23.4 grams of magnesium?

Answer 1

`5.78* 10^(23)` molecules

Step-by-step explanation:

m = Mass of Magnesium = 23.4 g

M = Molar mass of Magnesium = 24.305 g/mol

`N_A` = Avogadro's number =
`6.022* 10^(23)\ \text{mol}^(-1)`

Number of moles is given by

`n=(m)/(M)\\\Rightarrow n=(23.4)/(24.305)\ \text{mol}`

Number of molecules is given by

`nN_A=(23.4)/(24.305)* 6.022* 10^(23)=5.78* 10^(23)`

The sample has
`5.78* 10^(23)` number of molecules.