Calculate the number of atoms in each sample. a. 14.955 g Cr b. 39.733 g S c. 12.899 g Pt d. 97.552 g Sn

(a) 1.5×10^23 atoms

(b) 7.47×10^23 atoms

(c) 3.98×10^22 atoms

(d) 4.93×10^23 atoms

Explanation:

Number of atoms = number of moles × 6.02×10^23

(a) 14.955 g Cr = (14.955/60) × 6.02×10^23 = 1.5×10^23 atoms

(b) 39.733 g S = (39.733/32) × 6.02×10^24 = 7.47×10^23 atoms

(c) 12.899 g Pt = (12.899/195) × 6.02×10^23 = 3.98×10^22 atoms

(d) 97.552 g Sn = (97.552/119) × 6.02×10^23 = 4.93×10^23 atoms

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