Question

A solution is 40% ethanol (density = 0.789 g/mL) by volume and 60% water (density = 1.00 g/mL). If Tom Titan has 750.0 mL of the solution, what is the mass of ethanol in solution?

Answer #1

% ethanol (v/v) = volume of ethanol * 100 / volume of solution

40 = volume of ethanol * 100 / 750.0 mL

volume of ethanol = 300 mL

volume of water = volume of solution - volume of ethanol

= 750 mL - 300 mL

= 450 mL

density of ethanol = 0.789 g/mL

So,

mass of ethanol =density of ethanol* volume of ethanol

= 0.789 g/mL * 300 mL

= 236.7 g

density of water = 1.00 g/mL

So,

mass of water =density of water* volume of water

= 1.00 g/mL * 450 mL

= 450 g

total mass of solution = mass of ethanol + mass of water

= 236.7 g + 450 g

= 687 g

Answer: 687 g

The density of a 40 wt% solution of ethanol in water is 0.937
g/mL. The density of n-butanol is 0.810 g/mL. What is the
concentration of n-butanol in ppm if you dissolve 15 μL of this
alcohol in a 40 wt% solution of Ethanol in water. The final volume
of the solution is 25 mL. Assume that the density of the ethanol
solution does not change upon dissolution of the butanol. Use the
correct number of significant figures!

1.
Vodka is advertised to be 80 proof, which is 40% by volume of
ethanol, C2H5OH. Assuming the density of the solution is 1.0 g/mL
and the density of ethanol is 0.789 g/mL. If the solution is at
25oC, what is the vapor pressure of water over the solution?
2. Calculate the molarity and molality of a solution of 50
grams of ethanol, C2H5OH (density = 0.789 g/mL) which is dissolved
in 200 mL of water (density = 1.00 g/mL).

Vodka is advertised to be 80 proof, which is 40% by volume of
ethanol, C2H5OH. Assuming the density of the solution is 1.0 g/mL
and the density of ethanol is 0.789 g/mL. If the solution is at
25oC, what is the vapor pressure of water over the solution?
Please show all work with the correct answer. Thank
you!!!!!!!

What is 5% (v/v) ethanol expressed in molarity? Mr ethanol 46.06
and density 0.789 g/mL
2M
0.9M
1.2M
1.5M

If 0.125 L of aqueous solution with a density of 0.810 g/mL
contains 13.7 µl of ethanol, epress the concentration of ethanol in
ppm, ppb, molarity, molality, and vol%. Pure ethanol has a density
of 0.789 g/mL

The molecular weight of ethanol (CH3CH2OH)
is 46 and its density is 0.789 g/cm3.
a. What is the molarity of ethanol in beer that is 5%
ethanol by volume? [Alcohol content of beer varies from about 4%
(lite beer) to 8% (stout)].
b. The legal limit for a driver's blood alcohol content
varies, but 80 mg of ethanol per 100 ml of blood (usually referred
to as a blood alcohol level of 0.08) is typical. What is the
molarity of...

Vodka is 25% by mass ethanol (C2H5OH) and
has a density of 0.75 g/mL. Calculate the mole fraction of each
species (water and ethanol) in solution, and the molality of the
ethanol in vodka.

Ethanol (the drinking alcohol) C2H5OH, has a density of 0.789
g/cm3. How many pounds of ethanol would be in a drum containing 5.0
gallons of ethanol?

Part A
What is the mass percent of NaOH in a solution of 1.74 g NaOH in
165 g of water.
Express the mass percent to three significant figures.
Part B
What is the mass percent of ethanol in a solution of 7.80 mL of
ethanol (density = 0.789 g/mL) in 75.0 g of water?
Express the mass percent to three significant figures.

A solution of ethanol (d=0.795 g/mL) and water (H2O) is prepared
by placing 30.0 mL of ethanol in a 250.0 mL volumetric flask and
diluting with water to the flask etched mark . (a) what is the
molarity of the ethanol in this solution? (b) Next, 25.o mL of the
solution above is diluted to a final volume of 500.0 mL, what is
the new molarity of the diluted solution?

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