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<ol><li> A solution is made by dissolving 125 g Na2SO4 in 65.0 g water. Calculate the mole fraction of the solute and the solvent. (MM Na2SO4 = 142 g/mole; water = 18 g/mole)</li></ol>
2NaOH+H2SO4→Na2SO4+2H2O= 65/18 = 3.61moles125/142 = 0.88MTotal moles = 4.91H2O = 3.61/4.91 = 0.74Na2SO4 = 0.88/4.91= 0.179
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A solution is made by dissolving 1.25 grams of Na2SO4 in 65.0 grams of water. What is the mole fraction of solute?
2NaOH+H2SO4→Na2SO4+2H2O= 65/18 = 3.61moles125/142 = 0.88MTotal moles = 4.91H2O = 3.61/4.91= 0.74Na2SO4 = 0.88/4.91= 0.179
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A 95.5 grams of sodium sulfate (Na₂SO₄)is dissolved in 1150 grams of distilled H2O. Calculate the molality of the Na₂SO₄ solution. Molar mass: Na = 23 g/mol ; S = 32 g/mol ; O = 16 g/mol
Molar mass of Na2SO4= 142.04 g/mol95.5/142.04= 0.6720.672mol/1.15kg= 0.585mol/Kg
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An isotonic saline solution was prepared by dissolving 0.92 g of NaCI in enough distilled water to make 100 ml solution. What is the percent by mass/volume of the solution?
100-0.92= 99.0899.08/100×100= 99.08%
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An isotonic saline solution was prepared by dissolving 0.92g of NaClin 2 points enough distilled water to make 100ml solution. What is the percent by mass/volume of the solution?
Molecular weight of isotonic saline = 58.50.92×58.5 = 53.8253.92/100×100= 53.92%
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Calculate the percent concentration for vinegar made into solution made by dissolving 72.8 mL of acetic acid into 216.4 mL of water
8.7%
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Calculate the mass/volume percent, % (m/v) for the solute in each of the following solutions.
63g of Na2SO4 in 260mL of Na2SO4 solution
38g of sucrose in 360mL of a carbonated drink
For the Na2SO4 solution m/v is (63g/260mL)*100%= 24.23% . For a carbonated drink m/v is (38/360)*100% =10.55%
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Glucose is a sugar that is found abundantly in nature. What is the percent by mass of a solution made by dissolving 163 g of glucose in 755 g of water?
% by mass = mass of solute / mass of solution = 163 g/(163g + 755g) = 0.176 = 17.6%
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A solution is prepared by dissolving 20g benzene in 100g carbon tetrachloride. What is the percent by mass of the solution?
a. 17%
b. 20%
c. 83%
d. 500%
Solution.Mass= Mass of C6H6 + Mass of CCl4;Mass = 20g + 100g = 120g;Mass % of benzene = (20/120)×100% =17%;Mass % of carbon tetrachloride = (100/120)×100% = 83%;Answer: a....
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A solution of sulfuric acid was made by dissolving 20 grams of 98 percent sulfuric acid in 250 ml of water. Express the concentration of this solution in percent by weight
98% sulphuric acid means in 100 g sulphuric acid source exact amount of sulphuric acid, H2SO4 present 98 g. So in 20 g, exact amount of H2SO4 present =...
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