Test – Empirical and Molecular Formulas – 2

  1. A compound contains 75.0% carbon, 25.0% hydrogen by mass. Calculate its empirical formula.

  2. A compound contains 43.4% sodium, 11.3% carbon, and 45.3% oxygen by mass. Calculate its empirical formula.

  3. A compound contains 2.8g of silicon and 3.2g of oxygen. Calculate its empirical formula.

  4. Methanoic acid has the molecular formula CH2O2. Complete the table below to calculate the relative molecular mass.

    Element Number of atoms Relative atomic mass Total mass contribution
    Carbon 1 12 ?
    Hydrogen 2 1 ?
    Oxygen 2 16 ?
    Relative molecular mass (Mr) ?

  5. Butane has the molecular formula C4H10. Complete the table below to calculate the relative molecular mass.

    Element Number of atoms Relative atomic mass Total mass contribution
    Carbon 4 12 ?
    Hydrogen 10 1 ?
    Relative molecular mass (Mr) ?

  6. A compound has an empirical formula of CH2O and a relative molecular mass of 120. Determine its molecular formula.

  7. A compound has an empirical formula of C2H3O and a relative molecular mass of 86. Determine its molecular formula.

  8. A compound contains 92.3% carbon and 7.7% hydrogen by mass. Its relative molecular mass is 78. Determine its molecular formula.

  9. A compound contains 54.5% carbon, 9.1% hydrogen, and 36.4% oxygen by mass. Its relative molecular mass is 88. Determine its molecular formula.

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