(a)
Interpretation:
The reaction of the
Concept Introduction :
Change of enthalpy when the formation of 1mole of a compound from its elements with all substances in their standard states is referred to as the standard enthalpy of formation.
(a)
Answer to Problem 107AE
Explanation of Solution
(b)
Interpretation:
The reaction of the standard enthalpy of combustion of liquid ethanol should be written.
Concept Introduction :
Standard enthalpy of combustion- change in enthalpy when 1mole of a particular substance is completely burned in
(b)
Answer to Problem 107AE
Explanation of Solution
Change of enthalpy in burning (combine vigorously with oxygen) of 1mol of ethanol liquid under standard conditions in their standard states is the standard enthalpy of combustion of liquid ethanol.
(c)
Interpretation:The reaction of the standard enthalpy of neutralization of barium hydroxide solution by hydrochloric acid should be written.
Concept Introduction : Standard enthalpy of neutralization-change of enthalpy when solutions of alkali and acid react together to form 1mol of water under standard conditions.
(c)
Answer to Problem 107AE
Explanation of Solution
Under standard conditions, 1 mol of
The reaction is represented as follows:
(d)
Interpretation:
The reaction of the
Concept Introduction:
Change of enthalpy when the formation of 1mole of a compound from its elements with all substances in their standard states is referred to as the standard enthalpy of formation.
(d)
Answer to Problem 107AE
Explanation of Solution
(e)
Interpretation:
The reaction of the standard enthalpy of combustion of liquid benzene(
Concept Introduction:
Standard enthalpy of combustion- change in enthalpy when 1mole of a particular substance is completely burned in
(e)
Answer to Problem 107AE
Explanation of Solution
Change of enthalpy in burning (combine vigorously with oxygen) of 1mol of ethanol liquid under standard conditions in their standard states is the standard enthalpy of combustion of liquid ethanol.
(f)
Interpretation:
The reaction of enthalpy of solution of solid ammonium bromide should be written.
Concept Introduction:
Change of enthalpy when dissolution of a substance in a solvent at a constant pressure and a temperature by forming in infinite dilution.
(f)
Answer to Problem 107AE
Explanation of Solution
Solid
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Chapter 9 Solutions
Chemical Principles
- The enthalpy change for the following reaction is 393.5 kJ. C(s,graphite)+O2(g)CO2(g) (a) Is energy released from or absorbed by the system in this reaction? (b) What quantities of reactants and products are assumed? (c) Predict the enthalpy change observed when 3.00 g carbon burns in an excess of oxygen.arrow_forwardThe Romans used calcium oxide, CaO, to produce a strong mortar to build stone structures. Calcium oxide was mixed with water to give Ca(OH)2, which reacted slowly with CO2 in the air to give CaCO3. Ca(OH)2(s) + CO2(g) CaCO3(s) + H2O(g) (a) Calculate the standard enthalpy change for this reaction. (b) How much energy is evolved or absorbed as heat if 1.00 kg of Ca(OH)2 reacts with a stoichiometric amount of CO2?arrow_forwardOne step in the manufacturing of sulfuric acid is the conversion of SO2(g) to SO3(g). The thermochemical equation for this process is SO2(g)+12O2(g)SO3(g)H=98.9kJ The second step combines the SO3 with H2O to make H2SO4. (a) Calculate the enthalpy change that accompanies the reaction to make 1.00 kg SO3(g). (b) Is heat absorbed or released in this process?arrow_forward
- Write reactions for which the enthalpy change will be a. Hf for solid aluminum oxide. b. the standard enthalpy of combustion of liquid ethanol, C2H5OH(l). c. the standard enthalpy of neutralization of sodium hydroxide solution by hydrochloric acid. d. Hf for gaseous vinyl chloride, C2H3Cl(g). e. the enthalpy of combustion of liquid benzene, C6H6(l). f. the enthalpy of solution of solid ammonium bromide.arrow_forwardThe thermochemical equation for the burning of methane, the main component of natural gas, is CH4(g)+2O2(g)CO2(g)+2H2O(l)H=890kJ (a) Is this reaction endothermic or exothermic? (b) What quantities of reactants and products are assumed if H = 890 kJ? (c) What is the enthalpy change when 1.00 g methane burns in an excess of oxygen?arrow_forwardInsoluble PbBr2(s) precipitates when solutions of Pb(NO3)2(aq) and NaBr(aq) are mixed. Pb(NO3)2(aq) + 2 NaBr(aq) PbBr2(s) + 2 NaNO3(aq) rH = ? To measure the enthalpy change, 200. mL. of 0.75 M Pb(NO3)2(aq) and 200. mL of 1.5 M NaBr(aq) are mixed in a coffee-cup calorimeter. The temperature of the mixture rises by 2.44 C. Calculate the enthalpy change for the precipitation of PbBr2(s), in kJ/mol. (Assume the density of the solution is 1.0 g/mL., and its specific heat capacity is 4.2 J/g K.)arrow_forward
- Gasohol, a mixture of gasoline and ethanol, C2H5OH, is used as automobile fuel. The alcohol releases energy in a combustion reaction with O2. C2H5OH(l)+3O2(g)2CO2(g)+3H2O(l) If 0.115 g ethanol evolves 3.62 kJ when burned at constant pressure, calculate the combustion enthalpy for ethanol.arrow_forwardA 0.470-g sample of magnesium reacts with 200 g dilute HCl in a coffee-cup calorimeter to form MgCl2(aq) and H2(g). The temperature increases by 10.9 C as the magnesium reacts. Assume that the mixture has the same specific heat as water and a mass of 200 g. (a) Calculate the enthalpy change for the reaction. Is the process exothermic or endothermic? (b) Write the chemical equation and evaluate H.arrow_forward
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