Question

how many o atoms are in one formula unit of mg(no3)2?

Explanation:

Step1: Analyze the formula

In the formula \(Mg(NO_3)_2\), the sub - script outside the parentheses affects all the atoms inside the parentheses.

Step2: Calculate the number of O atoms

For the nitrate ion \(NO_3^-\), there are 3 O atoms. Since there are 2 nitrate ions (\((NO_3)_2\)), we multiply the number of O atoms in one nitrate ion by 2. So, \(3\times2 = 6\).

Answer:

6 O atoms