What masses of KBr and water are needed to produce 300.g of a solution that is 3.00 % bymass?
A)9.00 g of KBr and 300.g of water
B)9.00 g of KBr and 291 g of water
C)300.g of KBr and 9.00 g of water
D)291 g of KBr and 9.00 g of water

Question

Quizplus · Accepted Answer

Since the solution is 3.00% by mass, this means that 3.00 g of KBr is dissolved in 100 g of water. Therefore, to produce a 300 g solution that is 3.00% by mass, we need to dissolve (3.00 g / 100 g) x 300 g = 9.00 g of KBr in water. The remaining mass must be water, which is 300 g - 9.00 g = 291 g. Therefore, the correct choice is B.

What Masses of KBr and Water Are Needed to Produce