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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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4.62 ml c2h5OH ( m = 46.07 g/mol and density = 0.789g/mol) is combusted in the presence of 15.55g of o2 and 3.72 g of h2o . determine the precentage yeild c2h5oh10 + 3o2 = 2co2 + 3h2o
This reaction has a CO2 percent yield of 62.3% What will be the mass of CO2 EXPERIMENTALLY obtained when 44.5g O2 and 24.6g C2H5OH are reacted? Molar masses: C2H5OH...
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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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If 355 g of ethanol (C2H5OH), molar mass = 46 g / mol is added to 645 g of water,what is the molality of the ethanol? A 0.550 m B.7.71 m C.11.9 m D.21.7 m
A 0.550 m
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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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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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the standard enthalpy of combustion of ethane, carbon, and hydrogen are -1559.7 kJ/mol, -393kJ/mol and -286kJ/mol respectively.
Use Hess'ss law to find the enthalpy of formation of ethane
ΔHform(C2H6)=ΔHcomb(C2H6)-(2ΔHcomb(C)+3ΔHcomb(H2))=-1559.7-(2(-393)+3(-286))=84,3 kJ/mol
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Define enthalpy of combustion. Calculate the enthalpy of combustion of methanol if the enthalpies of formation of CO2,H20 andCH3OH are respectively .
-393.5kj/mol,-285.8kj/mol and -239.0kj/mol.
Answer: Enthalpy of combustion is the heat released during combustion of one mol amount of any substance by oxygen.You can calculate the combustion enthalpy of methanol using the enthalpy...
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What is the enthalpy change if 105 g of ethane is burned in a combustion reaction whose molar enthalpy of combustion is -1251 kJ/mol. *
n = m / MM (C2H6) = 30.07 g/moln (C2H6) = 105 / 30.07 = 3.5 moldelta H (C2H6) = - 1251 x 3.5 = -4367 kJ
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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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