PASSAGE-I :A mole of an atom is a collection of atoms whose total mass is the number of grams equal to the atomic mass. Since equal number of moles of different elements contain an equal number of atoms it becomes convenient to express the amounts of the elements in terms of moles. A mole represents a definite number of particles viz, atoms, molecules, ions or electrons. This definite number is called Avogadro number or Avogadro constant which is equal to `6.022 xx 10^(23)` Hence a mole represents `6.022 xx 10^(23)` particles of the substance. One mole of substance represents one gram-formula of the substance. One mole of a gas at standard temperature and pressure occupies 22.4 litres.
How many grams of sodium must be taken to get 1 mole of the element ?

Options

A. 23 g
B. 35.5 g
C. 63.5 g
D. 46 g

Explanation

To determine how many grams of sodium must be taken to get 1 mole of the element, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of a Mole**:
- A mole is a unit that represents a specific number of particles (atoms, molecules, etc.). For any element, 1 mole of that element corresponds to its atomic mass in grams.

2. **Identify the Atomic Mass of Sodium**:
- The atomic mass of sodium (Na) is given as 23 grams per mole. This means that 1 mole of sodium weighs 23 grams.

3. **Calculate the Mass for 1 Mole of Sodium**:
- Since we need 1 mole of sodium, we can directly use the atomic mass:
\[ \text{Mass of 1 mole of sodium} = 23 \text{ grams} \]

4. **Conclusion**:
- Therefore, to obtain 1 mole of sodium, you must take 23 grams of sodium.

### Final Answer:
To get 1 mole of sodium, you must take **23 grams** of sodium.

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