How Many Atoms Are Present in a Sample of Pure

question 4

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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