You have a 16.0-oz. (473-mL) glass of lemonade with a concentration of 2.89 M. The lemonade sits out on your counter for a couple of days, and 150. mL of water evaporates from the glass. What is the new concentration of the lemonade?
A) 9.11 M
B) 6.11 M
C) 4.23 M
D) 0.164 M
E) 19.3 M

Question

Quizplus · Accepted Answer

First, we need to find the initial number of moles of lemonade in the glass:
moles = concentration x volume = 2.89 M x 473 mL = 1367.97 mmol
Next, we need to find the final volume of the lemonade after 150 mL has evaporated:
final volume = initial volume - amount evaporated = 473 mL - 150 mL = 323 mL
Finally, we can calculate the new concentration:
new concentration = moles / final volume = 1367.97 mmol / 323 mL = 4.23 M

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