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mepinoargote
- Junior | Next Rank: 30 Posts
- Posts: 21
- Joined: Wed Apr 28, 2010 12:11 pm
Hi, english is not my first language, so i´m having trouble understanding the question 156 of the official guide (12th).
A tank contains 10,000 gallons of a solution that is 5% sodium chloride by volume. If 2,500 gallons of water evaporate from the tank, the remaining solution will be approximately what percent sodium chloride?
10,000 (0.05) = 500 gallons of sodium chloride
10,000-2500 = 7,500
500/7,500=6.67%
What exactly does "by volume" means? By looking at the answer i can deduce that even if 2500 gallons of the solution evaporate, the percent of the sodium remains 5 %, So every time a question gives a value "by volume" should i assume that the value given won´t change?. Please explain, thanks.
A tank contains 10,000 gallons of a solution that is 5% sodium chloride by volume. If 2,500 gallons of water evaporate from the tank, the remaining solution will be approximately what percent sodium chloride?
10,000 (0.05) = 500 gallons of sodium chloride
10,000-2500 = 7,500
500/7,500=6.67%
What exactly does "by volume" means? By looking at the answer i can deduce that even if 2500 gallons of the solution evaporate, the percent of the sodium remains 5 %, So every time a question gives a value "by volume" should i assume that the value given won´t change?. Please explain, thanks.
