Formula Unit Mass
Formula Unit Mass
Formula Unit Mass: The simplest combination of ions that produces an electrically neutral unit is called a formula unit of the ionic compound e.g. formula unit for sodium chloride is NaCl. Formula unit for ammonium sulphate is. The formula unit mass of a substance is the sum of the atomic masses of all atoms in a formula unit of a compound. We use the term ‘formula unit’ for those substances, which have their constituent particles as ions. Similarly, we use ‘molecular mass’ for atoms.
For example :
The molecular formula for ammonium sulphate is
Empirical formula of ammonium sulphate is
Therefore, the formula unit mass of can be calculated as:
| Types of atoms | Number of atoms (step 1) | Atomic mass (step 2) | Mass of each type of atom (step 3) |
| N | 2 | 14.007amu | 28.014 amu |
| H | 8 | 1.008 amu | 8.064 amu |
| S | 1 | 32.06 amu | 32.06 amu |
| O | 4 | 15.99 amu | 63.996 amu |
Formual mass of | 132.134 amu |
What is the mass of glucose ? | |||
| Right Option : B | |||
| View Explanation | |||
The molecular formula for __________________ is | |||
| Right Option : A | |||
| View Explanation | |||
What is the formula unit mass of Hydrochloric acid? | |||
| Right Option : C | |||
| View Explanation | |||
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