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 NA = 6.02 × 1023. )
A) 1.8 × 1019
B) 2.3 × 1028
C) 2.3 × 1024
D) 3.2 × 1028
Correct Answer:
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