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How Many Atoms Are Present in a Sample of Pure

Question 16

Multiple Choice

How many atoms are present in a sample of pure iron with a mass of 210 g? (The atomic mass of iron = 56 u and N_A = 6.02 × 10²³. )

A) 1.8 × 10¹⁹
B) 2.3 × 10²⁸
C) 2.3 × 10²⁴
D) 3.2 × 10²⁸

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