400 g of salt solution is prepared by dissolving 30 g of salt in water. What is the %(w/w) of this solution?
A) 0.075%
B) 7.5%
C) 0.069%
D) 6.9%

Question

Quizplus · Accepted Answer

To find the %(w/w) of a solution, we need to divide the mass of the solute (in this case, the salt) by the total mass of the solution (salt + water) and multiply by 100%.

mass of salt = 30 g 
mass of solution = 400 g

%(w/w) = (30 g / 400 g) x 100% 
%(w/w) = 7.5%

Therefore, the answer is B) 7.5%.

400 G of Salt Solution Is Prepared by Dissolving 30