Question

Question #038ae

Answer 1

54.41 grams.

Explanation:

In general, the mass of a substance can be found from the number of moles by:

`"mass" = "moles" xx "molar mass"`

For `"MgO"`, the molar mass of the molecule can be found by adding up the molar masses of its constituent atoms. That is, (values taken from Google)

`"molar mass"("MgO") = "molar mass"("Mg") + "molar mass"("O")`

`= "24.31 g.mol" + "16.00 g/mol"`

`"= 40.31 g/mol"`

Or, the molar mass of `"MgO"` might often be given to you. Either way,

`"mass" = "moles" xx "molar mass"`

`= "1.350 moles" xx "40.31 g/mol"`

`"= 54.41 g"` (rounded)