3. Explain the difference between a molecular formula and an empirical formula 4

Question

3. Explain the difference between a molecular formula and an empirical formula 4. Is the formula of a hydrate a molecular or empirical formula or both? Explain. 5. Fill in the table below. Based on the name provided, give the molecular formula and empirical formula and identify the substance as ionic or covalent. Name lonic or Covalent Molecular Formula Empirical Formula Carbon dioxide Dinitrogen tetrasulfide Iron (IlI) oxide Tetraphosphorus decaoxide Urea is a nitrogen containing waste product made during protein catabolism. (by mass) 46.7% N, 6.7% H, 20.0% C, and 26.6% O. urea? 6. Urea contains What is the empirical formula for

Explanation / Answer

3)

Empirical formula : the simple whole number ratio of atoms present in a molecule of the compound is called empirical formula.

Molecular formula : the total number of atoms present in the molecule of a compound is called molecular formula.

eg: H2O2 is molecular formula and empirical formula is HO

5)

6)

empirical formula = CH4N2O

molecular mass of urea = 60 g/mol

empirical mass = 12 + 4*1 + 2 * 14 + 16 = 60

number of empirical units = molecular mass / empirical mass = 60/60 = 1

Molecular formula of the compound = CH4N2O

Name of the compond Ionic or Covalent Molecular formula Empirical formula Carbon dioxide covalent CO2 CO2 Dinitrogen tetrasufide covalent N2S4 NS2 Iron(III) oxide Ionic Fe2O3 Fe2O3 Tetra Phosporous decoxide Covalent P4O10 P2O5

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