Number of Atoms and Moles: Solutions
Question 1:
Calculate the number of H atoms in 0.5 mol of C6H12O6
Solution Q1:
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 Q2:
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 Q3:
Number of moles × 6 × 6.02 × 1023 = 1.5 × 1024 ⇒ Number of moles = 15 / 36.12 = 0.41
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