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28.01.2021 •
Social Studies
Goods and services are given out to the people who show up before everyone else
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Ответ:
C = 52%
Therefore, the final concentration of the mixture is 52%
Explanation:
Given;
The total capacity of the tank = 24 gallons
Rate of evaporation of water r = 0.5 gallons/hour
Time of evaporation t = 2 hours
Initial Volume of mixture in the tank V = 1/4 × 24 = 6 gallons
Initial concentration of the mixture = 40%
Volume of sodium chloride in the mixture will be given as m.
m = 40% V = 40% of 6 = 2.4 gallons
Due to the evaporation the volume of the mixture would have reduced by to V'
V' = V - rt
V' = 6 - 0.5×2
V' = 5 gallons
Since the volume of sodium chloride in the mixture is not affected by the evaporation, m remain 2.4 gallons
the final concentration of water is
C = mass/volume
C = (5.0 - 2.4)/5
C = 2.6/5
C = 52%
Therefore, the final concentration of the mixture is 52%