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A solution is made by dissolving 1.25 g of C2H5OH in 11.6 g of H2O. Calculate the mass percent of C2H5OH, the mass percent of H2O, molality of C2H5OH.
Mass of C2H5OH = 1.25 g Mass of H2O = 11.6 g Mass percent of C2H5 OH = 1.25 × 100 / 1.25 + 11.6 = 125 / 12.86...
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the molar enthalpy of combustion of ethanol (c2H5OH) is -1366.8kj/mol what is the enthalpy change when 10.00 grams of ethanol is combusted
n(C2H5OH)=m/M=10/46 = 0.2174 molH= (-1366.8)*0.2174 = -297.14 kJAnswer: -297.14 kJ
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Wine is approximately 12% ethanol by volume. ethanol has a molar mass of 46.06 g/mol and a density of 0.789g/ml. How many moles of ethanol are present in a 750 ml of wine?
The volume of ethanol in 750 ml of wine is: 750 x 0.12 = 90 mlDensity = mass/volumeMass = density x volumeMass of pure ethanol = 0.789 x 90 =...
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A 95.5 grams of sodium sulfate (Na₂SO₄)is dissolved in 1150 grams of distilled H2O. Calculate the molality of the Na₂SO₄ solution. Molar mass: Na = 23 g/mol ; S = 32 g/mol ; O = 16 g/mol
Molar mass of Na2SO4= 142.04 g/mol95.5/142.04= 0.6720.672mol/1.15kg= 0.585mol/Kg
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a mixture of ethanol c2h5oh and water has a freezing point of -16.0 degree celsius. (a) What is the molality of the alcohol? (b) what is the weight percent of alcohol in the solution ?
a) Molality of the alcohol =8.6Mb)Weight percent of alcohol in the solution=28.35%
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A mixture of ethanol, C2H5OH, and water has a freezing point of −16.0 °C. (a) What is the molality of the alcohol? (b) What is the weight percent of alcohol in the solution?
Depression in freezing point is denoted by,Freezing point of water + Freezing point of solutionFrom the given dataButWhere freezing point depression constant for water
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Ethanol burns according to the following equation. C2H5OH + 3O2 > 2CO2 +3H2O if 15.0 mole of C2H5OH burns this way, how many moles of oxygen are needed?
21,91 mole
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From an initial mix of: 2 mol Cl2, 1 mol Br2, 0.5 mol I2, 0.5 mol Cl−, 1 mol Br−, 2 mol I−; the total quantity of I2 present after all possible reactions occur is
0.5 mol I2 and 0.5 mol Cl- will not react with anything; 2 mol I- will react with one mol of Cl2 producing one mol of I2: 2I- + Cl2...
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A sample of rubbing alcohol solution contains ethanol, C2H5OH(l). If the sample contains 1.25x10^23 atoms of hydrogen in the ethanol, what amount in moles of ethanol is in the sample?
The amount of moles for atom\molecule\compound etc. can be calculated based on amount of atom\molecule\structural units etc. using Avogadro constant (NA=6.02x10^23) that represents 1 mole. One molecule of ethanol consists...
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A sample of a wine contain 28% C2H5OH by volume and rest is H2O. Calculate mole fraction of
C2H5OH in wine, density of C2H5OH = 0.79 gm/ml, density of water = 1 gm/ml.
0.28 x 0.79 = 0.22 g.0.22/46 = 0.004 .
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