alleryA chemist mixes 4 L of a 15% solution with 6 L of a 25% solution. Strength of the mixture?
A19%
B21%
C20%
D22%
Answer & Solution
Correct answer: B. 21%
Solute is 0.6 + 1.5 = 2.1 L in 10 L, so 21%.
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