Arun Kumar Das Gupta , populerly know to his students as AKD sir, is a 1 st class M.Sc in inorganic chemistry from Calcutta university. He is also a 1 st class B.Ed from Calcutta university. He is teaching chemistry in secondary and senior secondary level for last 30 years. AKD sir is writer and editor of few books and articles.



  1. How many moles of Na are in 42 g of Na?
  2. How many moles of O are in 8.25 g of O?
  3. How much does 2.18 mol of Cu weigh?
  4. What is the mass of 0.28 mol of iron?
  5. How many atoms are in 7.2 mol of chlorine?
  6. How many atoms are in 36 g of bromine?
  7. How many moles are in 1.0 x 109 atoms?
  8. What is the mass of 1.20 x 1025 atoms of sulfur?
  9. How many moles of CO molecules are in 52 g of CO?
  10. How many moles of C2H6 are in 124 g?
  11. How many moles of CCl4 are there in 56 g?
  12. How much does 2.50 mol of H2SO4 weigh?
  13. How much does 0.25 mol of Fe2O3 weigh?
  14. How many molecules are there in 52 g of CO?
  15. How many formula units are in 22.4 g SnO2?
  16. How many molecules are in 116 g CCl4?
  17. What is the mass of 3.01 x 1023 formula units of Fe2O3?
  18. What is the mass of 1.2 x 1025 molecules of CO?
  19. How many O atoms are in 1.25 mol of SO2?
  20. How many moles of O atoms do you have when you have 1.20 x 1025 N2O5 molecules?
  21. How many formula units are in 5.33 mol of CuCl2?
  22. How many copper atoms are in 5.33 mol of CuCl2?
  23. How many moles of Cl atoms are in 5.33 mol of CuCl2?
  24. How many moles of CuCl2 contain 1.2 x 1023 atoms of Cl?
  25. How many O atoms are in 3.15 mol of SnO2?
  26. How many H atoms are in 17.5 g (NH4)2C2O4?

1.    1.8 mol Na
2.    0.516 mol O
3.    139 g Cu
4.    16 g Fe
5.    4.3 x 1024 Cl atoms
6.    2.7 x 1023 Br atoms
7.    1.7 x 10-15 mol
8.    639 g S
9.    1.9 mol
10.    4.12 mol
11.    0.36 mol
12.    245 g
13.    40. g
14.    1.1 x 1024 molecules
15.    8.95 x 1022 formula units
16.    4.54 x 1023 molecules
17.    79.9 g Fe2O3
18.    5.6 x 102 g CO
19.    1.51 x 1024 O atoms
20.    99.7 mol O
21.    3.21 x 1024 formula units
22.    3.21 x 1024 Cu atoms
23.    10.7 mol of Cl atoms
24.    0.10 mol CuCl2
25.    3.79 x 1024 O atoms
26.    6.79 x 1023 H atoms


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