Exercise on Number of Atoms and Moles: Solutions

Question 1: Calculate the number of H atoms in 0.5 mol of C₆H₁₂O₆

Solution:
Number of H atoms = 0.5 × 6.02 × 10²³ × 12 = 36 × 10²³ = 3.6 × 10²⁴

Question 2: How many oxygen atoms are in (a) 0.75 mol Ca(NO₃)₂
Solution:
Number of O atoms = 0.75 × 6.02 × 10²³ × 6 = 27.09 × 10²³ = 2.7 × 10²⁴

Question 3: How many moles of C₆H₅OH that contain 1.5 × 10²⁴ C atoms?

Solution:
Number of moles × 6 × 6.02 × 10²³ = 1.5 × 10²⁴ ⇒ Number of moles = 15 / 36.12 = 0.41

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Date of last modification: Summer , 2019