21. A 400.0 mL solution contains 15.0 g of ethanol (C,H,O). What is the concentration (in M) of ethanol? mas ethanol = 46.0108 glmol

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21. A 400.0 mL solution contains 15.0 g of ethanol (C,H,O). What is the concentration (in M) of
ethanol? mas ethanol = 46.0108 glmol
Transcribed Image Text:21. A 400.0 mL solution contains 15.0 g of ethanol (C,H,O). What is the concentration (in M) of ethanol? mas ethanol = 46.0108 glmol
SCAN
Standard data rates may apply.
23. What is the concentration (by mass) of the solute in a 25 °C solution prepared by dissolving
2.50x10 mol NazPO4 in 1.000 L of water (in ppm, ppb, and ppt, all to two decimal places)?
ppm; 4.10 x 10' ppb; 4.10x104 ppt
(2.50x10-7) Il63.94
24. A 20.0 mL aliquot of a 0.515 M aqueous solution is added to 125 mL of pure water. What is the
concentration (in M) of the new solution?
A: 0.0710
Transcribed Image Text:SCAN Standard data rates may apply. 23. What is the concentration (by mass) of the solute in a 25 °C solution prepared by dissolving 2.50x10 mol NazPO4 in 1.000 L of water (in ppm, ppb, and ppt, all to two decimal places)? ppm; 4.10 x 10' ppb; 4.10x104 ppt (2.50x10-7) Il63.94 24. A 20.0 mL aliquot of a 0.515 M aqueous solution is added to 125 mL of pure water. What is the concentration (in M) of the new solution? A: 0.0710
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