Question

what is the molar mass of mgo? 48.610 g/mol 40.304 g/mol 40.003 g/mol 45.255 g/mol

Explanation:

Step1: Find the molar mass of Mg

The molar mass of Mg (magnesium) is $24.305\ g/mol$.

Step2: Find the molar mass of O

The molar mass of O (oxygen) is $16.00\ g/mol$.

Step3: Calculate the molar mass of MgO

The formula for molar mass of MgO is $M = M_{Mg}+M_{O}$.
Substitute the values: $M = 24.305 + 16.00=40.305\ g/mol$ (close to $40.304\ g/mol$ considering rounding differences in atomic masses used in different references).

Answer:

$40.304\ g/mol$ (the blue - colored option)