Chem Mastery Emp Formula Set 1

4 Questions
Chem Mastery Emp Formula Set 1
Sample Question

Determine the empirical formula. 8.04% Li, 91.96% Bromide

LiBr

Li2Br

LiBr2

Li2Br2

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Questions and Answers
  • 1. 
    Determine the empirical formula. 8.04% Li, 91.96% Bromide
    • A. 

      LiBr

    • B. 

      Li2Br

    • C. 

      LiBr2

    • D. 

      Li2Br2

  • 2. 
    Determine the empirical formula. 28.6% magnesium, 14.3% carbon, 57.1% oxygen
    • A. 

      MgCO

    • B. 

      Mg2CO

    • C. 

      MgC2O

    • D. 

      MgCO2

    • E. 

      Mg2C2O

    • F. 

      MgC2O2

    • G. 

      Mg3CO

    • H. 

      MgC3O

    • I. 

      MgCO3

    • J. 

      Mg3C3O

    • K. 

      Mg3CO3

    • L. 

      MgC3O3

  • 3. 
    Determine the empirical formula of a compound with the following composition by mass: 60.0 % C, 12.0 % H and 28.0 % N.
    • A. 

      C2H6N

    • B. 

      C3H6N

    • C. 

      C5H12N2

    • D. 

      C6H12N2

    • E. 

      C5H12N

  • 4. 
    If this compound (Q3) has a molar mass of 300 g/mol, what is its molecular formula?
    • A. 

      C5H12N2

    • B. 

      C10H24N3

    • C. 

      C12H24N3

    • D. 

      C10H24N2

    • E. 

      C15H36N6

    • F. 

      C18H36N6

    • G. 

      C30H48N6