If mole fraction of sodium chloride in sodium chloride aqueous solution is 0.35, then mole fraction of water in the solution is

Answer

To find the mole fraction of water in a sodium chloride aqueous solution where the mole fraction of sodium chloride (NaCl) is given as 0.35, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Mole Fraction**:
- The mole fraction of a component in a solution is defined as the ratio of the number of moles of that component to the total number of moles of all components in the solution.
- If we denote the mole fraction of NaCl as \(X_{NaCl}\) and the mole fraction of water as \(X_{H2O}\), we have:
\[ X_{NaCl} + X_{H2O} = 1 \]

2. **Given Data**:
- We know that \(X_{NaCl} = 0.35\).

3. **Calculating Mole Fraction of Water**:
- Using the relationship from step 1, we can find \(X_{H2O}\):
\[ X_{H2O} = 1 - X_{NaCl} \]
- Substituting the value of \(X_{NaCl}\):
\[ X_{H2O} = 1 - 0.35 \]
\[ X_{H2O} = 0.65 \]

4. **Final Result**:
- The mole fraction of water in the sodium chloride aqueous solution is \(0.65\).

### Summary:
- The mole fraction of sodium chloride (NaCl) is \(0.35\).
- The mole fraction of water (H2O) is \(0.65\).