In chemistry laboratories, it is faster and more convenient to measure out liquids by volume with pipets than by mass with an electronic balance. Therefore, when prepare solutions, volume ratio, instead of mass ratio is used sometimes. We can define a new term, volume % of a component, similar to mass % of a component. Let’s use a solution that is made of A and B as an example to explain this concept. If the volume % of A is 70%, the solution is made of 70 mL A with 30 mL B. A solution is prepared by mixing
In chemistry laboratories, it is faster and more convenient to measure out liquids by volume with pipets than by mass with an electronic balance. Therefore, when prepare solutions, volume ratio, instead of mass ratio is used sometimes.
We can define a new term, volume % of a component, similar to mass % of a component. Let’s use a solution that is made of A and B as an example to explain this concept. If the volume % of A is 70%, the solution is made of 70 mL A with 30 mL B.
A solution is prepared by mixing acetonitrile, CH3CN, and methanol, CH3OH, together. The volume percentage of acetonitrile is 35.84%. The density of acetonitrile is 0.786 g/mL and the density of methanol is 0.791 g/mL. Assume that the volume is additive.
What is the mass percentage of acetonitrile in the solution? ____________%
What is the molarity of the solution? __________ M
What is the mole fraction of acetonitrile in the solution? ____________
What is the molality of the solution? __________ m
Given
A solution is prepared by mixing acetonitrile, CH3CN, and methanol, CH3OH, together. The volume percentage of acetonitrile is 35.84%. The density of acetonitrile is 0.786 g/mL and the density of methanol is 0.791 g/mL. Assume that the volume is additive.
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