Terrence measures the amount of water displaced by various objects when they are dropped into a graduated cylinder of water. By
looking at his data, he realizes that the amount of water displaced depends on either the mass or the volume of the object, depending on whether the object sinks or floats.
Which data table includes all the information Terrence needs to come to this conclusion?
Which data table includes all the information Terrence needs to come to this conclusion?
1 answer:
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<u>Answer:</u> The molality and molarity of zinc in the solution is 4.07 m and 28.11 M respectively.
<u>Explanation:</u>
Solute is the substance which is present in smaller proportion in a mixture and solvent is the substance which is present in larger proportion in a mixture.
We are given:
(m/m) % of Cu = 79 %
This means that 79 g of copper is present in 100 grams of alloy.
(m/m) % of Zn = 21 %
This means that 21 g of zinc is present in 100 grams of alloy.
As, zinc is present in smaller proportion. So, it is solute and copper is the solvent.
- <u>Calculating molality of zinc:</u>
To calculate molality of the zinc, we use the equation:
where,
= Given mass of solute (Zinc ) = 21 g
= Molar mass of solute (Zinc) = 65.3 g/mol
= Mass of solvent (copper) = 79 g
Putting values in above equation, we get:
- <u>Calculating molarity of zinc:</u>
To calculate volume of a substance, we use the equation:
Density of solution =
(Conversion factors used are: 1 kg = 1000 g & )
Mass of solution = 100 g
Putting values in above equation, we get:
To calculate the molarity of solution, we use the equation:
We are given:
Molar mass of zinc = 65.3 g/mol
Volume of solution = (Conversion factor:
)
Mass of zinc = 21.0 g
Putting values in above equation, we get:
Hence, the molality and molarity of zinc in the solution is 4.07 m and 28.11 M respectively.