Solution : QNo. 4

Here's how to determine the molarity of the solution step-by-step:

1. **Calculate the number of moles of NaOH:**
    * Given mass of NaOH = 2.46 g
    * Molar mass of NaOH = 40 g/mol
    * Number of moles = Mass / Molar mass
    * Number of moles = 2.46 g / 40 g/mol = 0.0615 mol

2. **Convert the volume of the solution from cm³ to Liters:**
    * Given volume = 100 cm³
    * Since 1 cm³ = 1 mL, the volume is 100 mL.
    * To convert mL to Liters, divide by 1000: 100 mL / 1000 = 0.1 L

3. **Calculate the Molarity of the solution:**
    * Molarity (M) = Moles of solute / Volume of solution in Liters
    * Molarity = 0.0615 mol / 0.1 L
    * Molarity = 0.615 mol/L

Therefore, the molarity of the solution is **0.615 M**.

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