30 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature

Options

A. 23%
B. 14%
C. 20%
D. 25%

Explanation

To find the concentration of sodium chloride (NaCl) dissolved in water, we can follow these steps:

### Step 1: Identify the mass of solute and solvent
- Mass of sodium chloride (solute) = 30 g
- Mass of water (solvent) = 100 g

### Step 2: Calculate the mass of the solution
- Mass of solution = Mass of solute + Mass of solvent
- Mass of solution = 30 g (NaCl) + 100 g (water) = 130 g

### Step 3: Calculate the concentration
- Concentration (in percentage) = (Mass of solute / Mass of solution) × 100
- Concentration = (30 g / 130 g) × 100

### Step 4: Perform the calculation
- Concentration = (30 / 130) × 100 = 23.08%

### Step 5: Round to appropriate significant figures
- The concentration can be rounded to 23% for simplicity.

### Final Answer
The concentration of sodium chloride in the solution is **23%**.

---