Question

A solution is prepared by adding 2 g of X” to 1 moIe of water. Mass percent of “X” in the solution is

• A. 20%
• B. 5%
• C. 10%
• D. 2%

Answer 1

The Correct Option is C

To find the mass percent of "X" in the solution, we need to calculate the percentage of the mass of "X" relative to the total mass of the solution.

1. The mass of "X" added to the solution is given as 2 g. 
2. We know that the molecular weight of water is approximately 18 g/mol. Therefore, 1 mole of water weighs 18 g.
3. The total mass of the solution is the sum of the mass of water and the mass of "X":
4. To calculate the mass percent of "X" in the solution, use the formula:
5. Substituting the given values, we get:

Thus, the mass percent of "X" in the solution is 10%. This matches the given correct answer choice.