Question

question 2
calculate the number of atoms for this formula, fe(no₃)₂.

Explanation:

Step1: Count Fe atoms

$1$ (only 1 Fe atom)

Step2: Count N atoms

$1 \times 2 = 2$ (2 nitrate groups, 1 N each)

Step3: Count O atoms

$3 \times 2 = 6$ (2 nitrate groups, 3 O each)

Step4: Sum all atoms

$1 + 2 + 6 = 9$

Answer:

9 (Note: The provided options do not include the correct calculated value; the accurate total number of atoms is 9)