What is the total number of atoms in 0.25 mol of NH₃?
Correct answer D. 6.02 × 10²³
Explanation
Each NH₃ molecule has 4 atoms, so atoms = 0.25 × 4 × 6.02 × 10²³ = 6.02 × 10²³. Counting only molecules or only 3 atoms gives the distractors.
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