Question Detail
Question
How many atoms are present in one molecule of trinitrotoluene (TNT) with the formula C7H5(NO2)3?
Correct Answer
Option D is the correct answer.
Detailed Explanation
C7H5(NO2)3 contains 7 C atoms, 5 H atoms, and within (NO2)3: 3 N atoms and 3 × 2 = 6 O atoms. Total atoms = 7 + 5 + 3 + 6 = 21.
Hint
Multiply the atoms inside parentheses by the subscript outside, then add all atoms.