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A research scientist discovered an isotope of ⁵⁴Cr.
How many neutrons are contained in a 0.025 mole sample?
a) 4.5 × 10²¹
b) 1.5 × 10²²
c) 4.5 × 10²³
d) 3.6 × 10²³
e) 6 × 10²⁴
f) None of these
Correct Answer: C
Chromium has atomic number 24, so ⁵⁴Cr has 30 neutrons per atom.
Calculation:
0.025 mol × 6 × 10²³ atoms/mol × 30 neutrons/atom
= 4.5 × 10²³ neutrons
Solution by Dr. Jim Romano
From the 2026 DAT Destroyer
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