Concept explainers
(a)
Interpretation:
It is to determine if the reaction is exothermic or endothermic. What should be done to maintain the temperature constant. Also, determine the state of the temperature if we ran the reactor adiabatically.
Concept introduction:
A system either absorbs heat or release heat to the surroundings. Exothermic reaction is the one where the heat gets released and endothermic reaction is the one where the heat gets absorbed. In exothermic, value of
(b)
Interpretation:
The
Concept introduction:
In standard heat of combustion, the reactant will be a hydrocarbon which reacts with oxygen and it forms carbon-di-oxide and water.
(c)
Interpretation:
The rate at which the heat is released or absorbed should be calculated.
Concept introduction:
In standard heat of combustion, the reactant will be a hydrocarbon which reacts with oxygen and it forms carbon-di-oxide and water.
(d)
Interpretation:
The reason for the value of Q to be greater when it is carried out in reactor should be explained.
Concept introduction:
In standard heat of combustion, the reactant will be a hydrocarbon which reacts with oxygen and it forms carbon-di-oxide and water.
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Chapter 9 Solutions
EBK ELEMENTARY PRINCIPLES OF CHEMICAL P
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- If nitric acid were sufficiently heated, it can be decomposed into dinitrogen pentoxide and water vapor: 2HNO3(l)N2O5(g)+H2O(g)Hrxn=+176kJ (a) Calculate the enthalpy change that accompanies the reaction of 1.00 kg HNO3 (). (b) Is heat absorbed or released during the course of the reaction?arrow_forwardBenzoic acid, C6H5COOH, is a common standard used in bomb calorimeters, which maintain a constant volume. If 1.20 g of benzoic acid gives off 31, 723 J of energy when burned in the presence of excess oxygen and in a water bath having a temperature of 24.6 C, calculate q, w, H, and U for the reaction.arrow_forwardIn the 1880s, Frederick Trouton noted that the enthalpy of vaporization of 1 mol pure liquid is approximately 88 times the boiling point, Tb, of the liquid on the Kelvin scale. This relationship is called Troutons rule and is represented by the thermochemical equation liquid gas H = 88 Tb, joules Combined with an empirical formula from chemical analysis, Troutons rule can be used to find the molecular formula of a compound, as illustrated here. A compound that contains only carbon and hydrogen is 85.6% C and 14.4% H. Its enthalpy of vaporization is 389 J/g, and it boils at a temperature of 322 K. (a) What is the empirical formula of this compound? (b) Use Troutons rule to calculate the approximate enthalpy or vaporization or one mole of the compound. Combine the enthalpy of vaporization per mole with that same quantity per gram to obtain an approximate molar mass of the compound. (c) Use the results of parts (a) and (b) to find the molecular formula of this compound. Remember that the molecular mass must be exactly a whole-number multiple of the empirical formula mass, so considerable rounding may be needed.arrow_forward
- One 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_forwardWould the amount of heat absorbed by the dissolution in Example 5.6 appear greater, lesser, or remain the same if the heat capacity of the calorimeter were taken into account? Explain your answer.arrow_forwardOn complete combustion at constant pressure, a 1.00-L sample of a gaseous mixture at 0C and 1.00 atm (STP) evolves 75.65 kJ of heat. If the gas is a mixture of ethane (C2H6) and propane (C3H8), what is the mole fraction of ethane in the mixture?arrow_forward
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