Solve the following problems: Show your solution:
1. What is the concentration of a solution made by dissolving 2.1 g of NaCl in 8.3 g of H₂O ?
2. What is the percent by volume of a solution form from 12.50 ml of ethanol & 57.50 ml of water?
3. Express the concentration in % by mass of solute when 45.0 g NaCl is dissolved in 258 g of water.
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Answer:
1.
[tex]m = \frac{2.1g}{8.3g} \times 100[/tex]
=25.30%
2.
[tex]v = \frac{12.50ml}{57.50ml} [/tex]
=21.74%
3.
[tex]m = \frac{45.0g}{258g} \times 100[/tex]
=17.44%