Q: (CDS-I/2021)
question_subject:
Science
question_exam:
CDS-I
stats:
0,13,18,7,6,13,5
keywords:
{'mass percentage': [0, 0, 0, 2], 'concentration': [0, 0, 4, 7], 'mass': [0, 0, 2, 3], 'solvent': [0, 0, 3, 1], 'solute': [0, 0, 1, 1], 'solution': [2, 0, 7, 14], 'water': [65, 15, 80, 129]}
To find the concentration of the solution in terms of mass by mass percentage, we need to calculate the ratio of the mass of the solute to the mass of the solution.
Given that the solution contains 20 g of solute and 180 g of solvent (which is water), the total mass of the solution is 20 g + 180 g = 200 g.
To calculate the mass by mass percentage, we can use the formula:
Mass by mass percentage = (mass of solute / mass of solution) x 100
Plugging in the values, we get:
Mass by mass percentage = (20 g / 200 g) x 100 = 10%
Therefore, the concentration of the solution in terms of mass by mass percentage is 10%.
Therefore, the correct answer is option 3.