To calculate the molarity of methanol in the solution, we use the formula:

$\text{Molarity (M)} = \frac{\text{moles of solute}}{\text{volume of solution in liters}}$

Step 1: Calculate the moles of methanol

The moles of methanol can be calculated using its mass and molar mass:

$\text{moles of methanol} = \frac{\text{mass of methanol}}{\text{molar mass of methanol}} = \frac{3.6\text{ g}}{32.04\text{ g/mol}}$

$\text{moles of methanol} \approx 0.1123 \text{ mol}$

Step 2: Convert the volume of the solution to liters

Since the solution is 100 mL, we convert it to liters:

$\text{volume in liters} = \frac{100}{1000} = 0.100 \text{ L}$

Step 3: Calculate the molarity

Now, substitute the moles of methanol and the volume of the solution into the molarity formula:

$\text{Molarity} = \frac{0.1123 \text{ mol}}{0.100 \text{ L}} = 1.123 \text{ M}$

Thus, the molarity of methanol in the solution is 1.123 M.

Would you like further details or explanations on any step? Here are five related questions you might find helpful:

1. What is the difference between molarity and molality?
2. How would you calculate the molarity if the volume of the solution changes?
3. What are other methods to express concentration besides molarity?
4. How do temperature changes affect molarity?
5. What is the significance of molar mass in chemical calculations?

Tip: Always make sure the volume is in liters when calculating molarity, as this unit ensures consistency.