Answer
The number of atoms is found by multiplying the subscript of the atom by the subscript of the parenthesis.
Work Step by Step
$Ba(NO_{3})_{2}$ has 2 Nitrogens and 6 Oxygens for every Barium.
(1 x 2) = 2
(3 x 2) = 6
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.