Ethanol is a possible fuel.Use average bond energies to calculate ΔHrxn for the combustion of ethanol. CH3CH2OH (g) +...
Ethanol is a possible fuel.Use average bond energies to calculate ΔHrxn for the combustion of ethanol.
CH3CH2OH (g) + 3O2(g) ------> 2CO2 (g) +3H2O(g)
ΔHrxn= ______ kJ/mol
Homework Answers
Write the balanced equation for the combustion of ethanol.
Calculate the value of enthalpy of reaction by using the standard values of bond energies of reactants and products.
A balanced equation is an equation which contains all the reactants and products in a fixed ratio. A balanced equation has the following characteristics:
1)It should follow the law of conservation of mass.
2)The total number of different types of elements on reactant side should be equal to the product side.
3)Stoichiometric coefficients are put in front of the molecules on both the reactant and product side to balance a given reaction. The coefficients to be used are whole number or fractional number.
Combustion is a chemical process in which the substance is burned in the presence of oxygen. The products formed are called combustion products.
The amount of heat released on combustion of a substance is called the heat of combustion of that substance. It is denoted by 
. The unit of heat of combustion is 
.
It is calculated by subtracting the bond energies of product from the reactants in a balanced reaction.
The combustion reaction of ethanol is written as follows:
The standard bond energies are as follows:
The combustion reaction of ethanol is written as follows:
The enthalpy of the above reaction is the heat of combustion of ethanol.
The enthalpy of the above reaction is calculated as follows:
The heat of combustion of ethanol, 
, per mole of ethanol is 
.
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Ethanol is a possible fuel.Use average bond energies to calculate ΔHrxn for the combustion of ethanol. CH3CH2OH (g) +...
Given the following reaction: CH3CH2OH(l)+3O2(g)→2CO2(g)+3H2O(l)CH3CH2OH(l)+3O2(g)→2CO2(g)+3H2O(l) ∆H = –2200 kJ/mol CH3CH2OHCH3CH2OH a) This reaction is... Select one...
Given the following reaction: CH3CH2OH(l)+3O2(g)→2CO2(g)+3H2O(l)CH3CH2OH(l)+3O2(g)→2CO2(g)+3H2O(l) ∆H = –2200 kJ/mol CH3CH2OHCH3CH2OH a) This reaction is... Select one or more: a. exothermic b. endothermic
Given the following reaction: CH3CH2OH(l)+3O2(g)→2CO2(g)+3H2O(l)CH3CH2OH(l)+3O2(g)→2CO2(g)+3H2O(l) ∆H = –2200 kJ/mol CH3CH2OHCH3CH2OH c) If you add heat to...
Given the following reaction: CH3CH2OH(l)+3O2(g)→2CO2(g)+3H2O(l)CH3CH2OH(l)+3O2(g)→2CO2(g)+3H2O(l) ∆H = –2200 kJ/mol CH3CH2OHCH3CH2OH c) If you add heat to the system, which of the following will occur? Check all that apply. Select one or more: a. the reaction will shift left b. the reaction will shift right c. [CH3CH2OHCH3CH2OH] will increase d. [H2OH2O] will decrease e. [O2O2] will decrease f. [CO2CO2] will increase
Given the following reaction: CH3CH2OH(l)+3O2(g)→2CO2(g)+3H2O(l)CH3CH2OH(l)+3O2(g)→2CO2(g)+3H2O(l) ∆H = –2200 kJ/mol CH3CH2OHCH3CH2OH b) If you increase [CH3CH2OHCH3CH2OH], which...
Given the following reaction: CH3CH2OH(l)+3O2(g)→2CO2(g)+3H2O(l)CH3CH2OH(l)+3O2(g)→2CO2(g)+3H2O(l) ∆H = –2200 kJ/mol CH3CH2OHCH3CH2OH b) If you increase [CH3CH2OHCH3CH2OH], which of the following will occur? Check all that apply. Select one or more: a. the reaction will shift left b. Heat will be released c. the reaction will shift right d. [CO2CO2] will increase e. [O2O2] will decrease f. [H2OH2O] will decrease
8. Given the following balanced reaction for the combustion of ethanol, an alternative fuel and gasoline...
8. Given the following balanced reaction for the combustion of ethanol, an alternative fuel and gasoline additive C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(g) and the following table of standard enthalpies of formation. How much energy (in kJ) is released from the combustion of 1.25kg of ethanol? (Continue on the next page)
Use average bond energies to calculate ΔHrxn for the following hydrogenation reaction: H2C=CH2(g)+H2(g)→H3C−CH3(g)
Use average bond energies to calculate ΔHrxn for the following hydrogenation reaction: H2C=CH2(g)+H2(g)→H3C−CH3(g)
Part C Use bond energies to calculate ΔHrxn for the following reaction: N2 (g) + 3H2...
Part C Use bond energies to calculate ΔHrxn for the following reaction: N2 (g) + 3H2 (g) → 2NH3 (g) Express your answer in kilojoules as an integer kJ Submit My Answers Give Up
Gasohol is a mixture of gasoline and ethanol (grain alcohol), C2H5OH. Calculate the maximum work that...
Gasohol is a mixture of gasoline and ethanol (grain alcohol),
C2H5OH. Calculate the maximum work that could be obtained at 25 ºC
and 1 atm by burning 1 mol of C2H5OH.
C2H5OH(l ) + 3O2(g)-------> 2CO2(g) + 3H2O(g)
Review Problem 18.089 Incorrect. Gasohol is a mixture of gasoline and ethanol (grain alcohol), C2H5OH. Calculate the maximum work that could be obtained at 25 °C and 1 atm by burning 1 mol of C2H5OH. C2H5OH(1) + 302(g) 2C02(g) + 3H2O(g) -3976...
1) C2H6 (g) -----> C2H4 (g) + H2 (g) ΔH1 = ? 2) C2H6 (g) +...
1) C2H6 (g) -----> C2H4 (g) + H2 (g) ΔH1 = ? 2) C2H6 (g) + 3.5O2 (g) -----> 2CO2 (g) + 3H2O (l) ΔH2 = -1560 kJ/mo 3) C2H4 (g) + 3O2 (g) -----> 2CO2 (g) + 2H2O (l) ΔH3 = -1411 kJ/mol 4) 2H2O (l) -----> 2H2 (g) + O2 (g) ΔH4 = 571.6 kJ/mol How much heat is transferred between the system and the surroundings when 25 grams of ethane (C2H6) decomposes to produce ethylene (C2H4) and...
Brazilains are quite familiar with fueling their automobiles with ethanol, a fermentation product from sugarcane. Calculate...
Brazilains are quite familiar with fueling their automobiles with ethanol, a fermentation product from sugarcane. Calculate the standard molar enthalpy for the complete combustion of liquid ethanol (C2H5OH) using the standard enthalpies of formation of the reactants and the products. C2H5OH (l) + 3O2 (g) --> 2CO2 (g) + 3H2O (g)
The combustion reaction of dimethylhydrazine is used to fuel rockets. (CH3)2NNH2(l)+4O2(g)N2(g)+4H2O(g)+2CO2(g) ΔHrxn= –1694 kJ Calculate the...
The combustion reaction of dimethylhydrazine is used to fuel
rockets.
(CH3)2NNH2(l)+4O2(g)N2(g)+4H2O(g)+2CO2(g)
ΔHrxn= –1694 kJ
Calculate the enthalpy change for the following reaction:
2N2(g)+8H2O(g)+4CO2(g)2(CH3)2NNH2(l)+8O2(g)
ΔHrxn= kJ
Part C Use bond energies to calculate ΔHrxn for the following reaction: N2 (g) + 3H2 (g) → 2NH3 (g) Express your answer in kilojoules as an integer kJ Submit My Answers Give Up
Gasohol is a mixture of gasoline and ethanol (grain alcohol),
C2H5OH. Calculate the maximum work that could be obtained at 25 ºC
and 1 atm by burning 1 mol of C2H5OH.
C2H5OH(l ) + 3O2(g)-------> 2CO2(g) + 3H2O(g)
Review Problem 18.089 Incorrect. Gasohol is a mixture of gasoline and ethanol (grain alcohol), C2H5OH. Calculate the maximum work that could be obtained at 25 °C and 1 atm by burning 1 mol of C2H5OH. C2H5OH(1) + 302(g) 2C02(g) + 3H2O(g) -3976...
The combustion reaction of dimethylhydrazine is used to fuel
rockets.
(CH3)2NNH2(l)+4O2(g)N2(g)+4H2O(g)+2CO2(g)
ΔHrxn= –1694 kJ
Calculate the enthalpy change for the following reaction:
2N2(g)+8H2O(g)+4CO2(g)2(CH3)2NNH2(l)+8O2(g)
ΔHrxn= kJ
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