Types Of Solutions

The hardness of water sample containing. 0.002 mole of dissolved in 1 L of water. Number of moles ie, mass of in 1 L of water. g of contains = 0.240 g of of contains of of g of water contains = 240 g of 120 g of 240 g of of Hence, hardness of ppm

Concept: Solubility of gases in water depends on:
• Polarity
• Ability to form hydrogen bonds
• Chemical interaction with water

Step 1: Analyze gases.

• Formaldehyde Polar, forms hydrogen bonds → highly soluble
• Methane Non-polar → low solubility
• Moderately soluble
• Vinyl chloride Low polarity
• Argon Noble gas, very low solubility

Step 2: Select highest solubility.
Formaldehyde has maximum interaction with water.

Concept:

Step 1: Lowest molar mass solvent.
Carbon tetrachloride gives highest .

Concept:

Step 1: Take 1 L solution.
Moles of solute = 3 mol Mass of solution: Mass of solute:

Step 2: Mass of solvent.


Step 3: Molality.

Step 1: Understanding the Concept:
Molarity (M) = moles of solute volume of solution in liters. Mass = moles molar mass.

Step 2: Detailed Explanation:
Volume = 250 mL = 0.25 L. Molarity = 0.5 M.
Moles of X = M V(L) = moles.
Mass = moles molar mass = g.

Step 3: Final Answer:
The required mass is 5 g.

Concept:

Step 1: Convert solvent


Step 2: Find moles


Step 3: Mass
Final Conclusion:
Option (A)

Step 1: Use Freezing Point Depression Formula


Step 2: Substitute Given Values


Step 3: Put Values in Formula


Step 4: Simplify Equation


Step 5: Calculate Molecular Mass


Step 6: Final Answer

Step 1: Understanding the Concept:
Molarity ( ) is defined as the number of moles of solute dissolved per liter of solution. To find the mass required, we first calculate the moles needed using the molarity formula, and then convert moles to mass using the molar mass.

Step 2: Key Formula or Approach:


Combining these:

Step 3: Detailed Explanation:
Given values:
- Molarity ( ) =
- Volume of solution ( ) =
- Molar mass of solute ( ) =
First, find the number of moles required:



Now, calculate the mass from the number of moles:




Step 4: Final Answer:
The required mass of the organic compound is 8.4 g.

Concept:
• Molarity:

Step 1: Moles required


Step 2: Mass of methanol


Step 3: Volume using density
Final Conclusion:
Option (C)