Which is distilled first ?

Options

A. Liquid `H_(2)`
B. Liquid `CO_(2)`
C. Liquid `O_(2)`
D. Liquid `N_(2)`

Answer

To determine which liquid will distill first among liquid H2, liquid carbon dioxide, liquid O2, and liquid N2, we need to analyze their boiling points based on their molecular masses and intermolecular forces.

### Step-by-Step Solution:

1. **Understand Distillation**: Distillation is a process that separates components in a mixture based on differences in their boiling points. The liquid with the lowest boiling point will distill first.

2. **Identify the Liquids and Their Molecular Masses**:
- Liquid H2 (Hydrogen): Molecular mass = 2 g/mol (1 g/mol for each H atom, and there are 2 H atoms).
- Liquid CO2 (Carbon Dioxide): Molecular mass = 12 (C) + 2 × 16 (O) = 44 g/mol.
- Liquid O2 (Oxygen): Molecular mass = 2 × 16 = 32 g/mol.
- Liquid N2 (Nitrogen): Molecular mass = 2 × 14 = 28 g/mol.

3. **Determine the Weakness of Intermolecular Forces**: The strength of intermolecular forces is inversely related to molecular mass. Generally, lighter molecules have weaker intermolecular forces, which leads to lower boiling points.

4. **Compare Molecular Masses**:
- H2: 2 g/mol
- CO2: 44 g/mol
- O2: 32 g/mol
- N2: 28 g/mol

From the above, we can see that liquid H2 has the lowest molecular mass.

5. **Conclude on Boiling Points**: Since liquid H2 has the lowest molecular mass, it will have the weakest intermolecular forces and thus the lowest boiling point. Therefore, it will distill first.

6. **Final Answer**: Liquid H2 will be distilled first.