1.What is the percent by volume of chemical that contains 90 ml of acid dissolved in 250 ml of water?
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2.What is the percent by volume of ethanol that contains 60 ml of ethanol and 40ml of water?
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3. For an aquaruan to maintain a salt concentration similar to ocean, it must contain 45 gramis sodrum chloride per 100 grams of water. What is the % by mass of sodium chloride in the solution?
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2.What is the percent by volume of ethanol that contains 60 ml of ethanol and 40ml of water?
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3. For an aquaruan to maintain a salt concentration similar to ocean, it must contain 45 gramis sodrum chloride per 100 grams of water. What is the % by mass of sodium chloride in the solution?
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Answer:
1. )26.47%
2.)60%
3.)31.03%
Explanation:
1) given: 90 ml of acid, 250 ml of water
formula: volume of solute/volume of solvent ×100%
solution: 90 ml/250 ml × 100%
90 ml/ 250 + 90 ml = 90/ 340
90÷340= 0.2647
0.2647×100= 26.47%
2). given: 60 ml of ethanol,40 ml of water
formula : same as no.1
solution:
60 ml / 40 ml ×100%
60 ml /40+60ml =60/100
60÷100= 0.6
0.6×100= 60 %
3). given 45g of sodrum chloride,100g of water
formula : mass of solute/mass of solvent
solution:
45 g/100g×100%
45/100+45 = 45g/145g
45÷100 =0.3103
0.3103. × 100 =31.03%
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