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Worksheet 18 . Topic 5

Set A: Molecular and empirical formulas Objective: To test your ability to recognize empirical
formulas, and be able to reduce molecular formulas
to empirical formulas

Below are lists of formulas. Circle all those that are empirical formulas.

22. a) CH4 b) C3H6 c) N2O4 d) Na2SO4

e) C5H10 f) Al2O3 g) NH4NO3 h) HC2H3O2

For each molecular formula given below: Determine and write down the greatest common factor (GCF)
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for the subscripts in the formula. Then write the correct empirical formula.

Molecular formulas GCF Correct empirical formula
23. S2O4

24. C4H10

25. C6H10
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Need help? Study Book pg 99 – 100 Set 4 - 6
26. N2F2

27. C6H12O6

28. C2H4O2

29. C3H6

30. K2S2O4

31. N2O2

32. C6H12Cl2O2

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