Question

how many oxygen atoms are in the formula fe₂(cr₂o₇)₃? view available hint(s) 3 6 7 21

Explanation:

Step1: Analyze the sub - formula for oxygen

In the formula \(Fe_2(Cr_2O_7)_3\), the part related to oxygen is \(O_7\) within the parentheses.

Step2: Consider the multiplier outside the parentheses

The multiplier outside the parentheses \((Cr_2O_7)\) is 3. To find the total number of oxygen atoms, we multiply the number of oxygen atoms in the sub - formula (\(O_7\)) by the multiplier. So we calculate \(7\times3\).

$$7\times3 = 21$$

Answer:

21