ANSWER:
Problem 1
What is percentage by mass of 50g salt (NaCL) dissolved in a 500g of water.
GIVEN:
- mass of solute: 50g
- mass of solution: 550g
UNKNOWN: (What is ASKED?)
- What is the mass percent of solute (50g salt) dissolved in solvent (500g of water)?
EQUATION (What is formula?):
- mass percent = [tex]\frac{mass \ of \ solute }{mass \ of \ solution} \ x \ 100[/tex]
SOLUTION:
solute: 50g
solvent: 500g
500 + 50 = solution
solution: 550
mass percent = [tex]\frac{50}{550}[/tex] [tex]x \ 100[/tex]
= 9.09 %
ANSWER: 9.09 %
Problem 2
What is the percent by volume concentration of a solution in which 75ml of ethanol is diluted to a volume 250ml?
GIVEN:
- mass of solute: 75ml
- mass of solution: 325ml
UNKNOWN: (What is ASKED?):
- What is the percent by volume concentration of a solute and solution?
EQUATION: (What is formula?)
[tex]percent \ by \ volume = \frac{volume \ of \ solute}{(volume \ of \ solute)\ + (\ volume \ of \ solvent)} \ x \ 100[/tex]
SOLUTION:
solute: 75ml
solvent: 250ml
250 + 75 = solution
[tex]percent \ by \ volume = \frac{75ml}{(75ml)\ + (250ml)} \ x \ 100[/tex] = 23.077%
= 23.077%
ANSWER: 23.077%
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