Understanding Chemical Compounds

In a compound with sodium, oxygen, and hydrogen, how many atoms are there if there are no subscripts or coefficients?

• 2 atoms

• 1 atom

• 4 atoms

• 3 atoms

If a compound has a subscript of 3 next to oxygen and a coefficient of 4, how many oxygen atoms are present?

• 12 oxygen atoms

• 4 oxygen atoms

• 16 oxygen atoms

• 3 oxygen atoms

In a compound with hydrogen, nitrogen, and oxygen, what is the total number of atoms if the coefficient is 4 and the subscript for oxygen is 3?

• 16 atoms

• 22 atoms

• 18 atoms

• 20 atoms

How many hydrogen atoms are there in a compound with a subscript of 2 inside parentheses and a coefficient of 4?

• 8 hydrogen atoms

• 4 hydrogen atoms

• 10 hydrogen atoms

• 6 hydrogen atoms

For a compound with magnesium, oxygen, and hydrogen, if the subscript outside the parentheses is 2 and the coefficient is 4, how many magnesium atoms are there?

• 2 magnesium atoms

• 8 magnesium atoms

• 4 magnesium atoms

• 6 magnesium atoms