Question

How many molecules of ethanol (C2H5OH) (the alcohol in alcoholic beverages) are present in 135 mL of ethanol? The density of ethanol is 0.789 g/cm3.

Answer #1

**density = 0.789 g/cm^3**

**density = 0.789 g/mL**

**volume = 135 mL**

**use:**

**density = mass / volume**

**0.789 g/mL = mass / 135 mL**

**mass = 106.5 g**

**Molar mass of C2H5OH,**

**MM = 2*MM(C) + 6*MM(H) + 1*MM(O)**

**= 2*12.01 + 6*1.008 + 1*16.0**

**= 46.068 g/mol**

**mass(C2H5OH)= 106.5 g**

**number of mol of C2H5OH,**

**n = mass of C2H5OH/molar mass of C2H5OH**

**=(106.5 g)/(46.068 g/mol)**

**= 2.312 mol**

**number of molecules = number of mol * Avogadro’s
number**

**number of molecules = 2.312 * 6.022*10^23
molecules**

**number of molecules = 1.39*10^24 molecules**

**Answer: 1.39*10^24 molecules**

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?

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!!!!!!!

Blood alcohol content is usually measured as the mass of ethanol
(C2H5OH, FM = 46.068 g/mole) per volume of blood. More
specifically, the results are reported in g/dL. If the density of
blood is 1.06 g/mL what is the molality and molarity of a BAC that
is 0.15 g/dL?

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 (C2H5OH) boils at 78∘C. Its density is 0.789 g/mL. The
enthalpy of vaporization is 38.56 kJ/mol. The specific heat of
liquid ethanol is 2.3 J/g−K.
1. How much heat is required to convert 25.0 g of ethanol at 30
∘C to the vapor phase at 78 ∘C?
2. Place the following substances in order of decreasing
volatility: CH4, CBr4, CH2Cl2, CH3Cl, CHBr3, and CH2Br2. Rank from
most volatile to least volatile. To rank items as equivalent,
overlap them.
3....

Calculate the molality of a 6.55 M ethanol
(C2H5OH) solution whose density is 0.9245
g/mL.

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?

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

A 600.0 mL bottle of Listerine is of a 21 % (v/v) ethyl
alcohol.
A. What is the volume (in mL) of ethyl alcohol in the
bottle?
B. If the density of ethyl alcohol is 0.789 g/mL and the molar
mass is 46.07 g/mol, calculate the molarity of ethyl alcohol in
Listerine.

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