EBK ELEMENTARY PRINCIPLES OF CHEMICAL P
4th Edition
ISBN: 9781119192107
Author: BULLARD
Publisher: JOHN WILEY+SONS,INC.-CONSIGNMENT
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Chapter 7, Problem 7.45P
Air at 38°C and 97% relative humidity is to be cooled to 14°C and fed into a plant area at a rate of
510 m3/min.
(a) Calculate the rate (kg/mm) at which water condenses.
(b) Calculate the cooling requirement in tons (1 ton of cooling = 12,000 Btu/h), assuming that the enthalpy of water vapor is that of saturated steam at the same temperature and the enthalpy of dry air is given by the expression
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c) Calculate the standard enthalpy change for the reaction
3C(s) + 4H2 (g)
C;H8 (g)
Given that
C(s) + O2 (g)
CO2 (g)
AH° = -394 kJmol·'
H2 (g) + ½O2 (g)
H2O (I)
AH° = -286 kJmol
C3H8 (g) + 502 (g)
3CO2 (g) + 4H2O (I) AH° = -2220 kJmol·'
In a steam boiler, hot gases from a fire transfer heat to water which vapourizes at constant temperature.In certain case, the gases are cooled from 1100°C to 550°C while the water evaporates at 220°C. Thespecific heat of gases is 1.005 kJ/kg K, and the latent heat of water at 220°C is 1858.5 kJ/kg. All the heattransferred from the gases goes to the water. How much does the total entropy of the combined system ofgas and water increase as a result of irreversible heat transfer ? Obtain the result on the basis of 1 kg ofwater evaporated. If the temperature of the surroundings is 30°C find the increase in unavailable energydue to irreversible heat transfer.
In a generic chemical reaction involving reactants and B and products C and D, aA + bB cC + dD, the standard enthalpy AHin of the reaction is given by
AHixn = CAH; (C) + dAH; (D) —aAH (A) – bAH (B)
Notice that the stoichiometric coefficients, a, b, c, d, are an important part of this equation. This formula is often generalized as follows, where the first sum on the
right-hand side of the equation is a sum over the products and the second sum is over the reactants:
where m and n represent the appropriate stoichiometric coefficients for each substance.
Part A
What is AHxn for the following chemical reaction?
CS2(g) + 2H₂O(1)→CO2(g) + 2H₂S(g)
You can use the following table of standard heats of formation (AH) to calculate the enthalpy of the given reaction.
■
μÅ
Value
AHrxn=products H - Σreactants mΔΗ
Element/ Compound
H(g)
H₂(g)
H₂O(1)
CS2 (g)
C(g)
C(s)
Units
?
Standard Heat of
Formation (kJ/mol)
Express the standard enthalpy of reaction to three significant figures and include the…
Chapter 7 Solutions
EBK ELEMENTARY PRINCIPLES OF CHEMICAL P
Ch. 7 - A certain gasoline engine has an efficiency of...Ch. 7 - Prob. 7.2PCh. 7 - Prob. 7.3PCh. 7 - Prob. 7.4PCh. 7 - Liquid ethanol is pumped from a large storage tank...Ch. 7 - Air at 300°C and 130 kPa flows through a...Ch. 7 - Prob. 7.7PCh. 7 - Prob. 7.8PCh. 7 - Prob. 7.9PCh. 7 - Prob. 7.10P
Ch. 7 - Prob. 7.11PCh. 7 - Prob. 7.12PCh. 7 - A piston?tted cylinder with a 6-cm inner diameter...Ch. 7 - Prob. 7.14PCh. 7 - Prob. 7.15PCh. 7 - Prob. 7.16PCh. 7 - Prob. 7.17PCh. 7 - Prob. 7.18PCh. 7 - Prob. 7.19PCh. 7 - Prob. 7.20PCh. 7 - Air is heated from 25°C to 140°C prior to entering...Ch. 7 - Prob. 7.22PCh. 7 - Prob. 7.23PCh. 7 - Prob. 7.24PCh. 7 - Prob. 7.25PCh. 7 - The conversion of the kinetic energy of wind to...Ch. 7 - Prob. 7.27PCh. 7 - Prob. 7.28PCh. 7 - Liquid water is fed to a boiler at 24°C and 10 bar...Ch. 7 - Prob. 7.30PCh. 7 - Prob. 7.31PCh. 7 - Saturated steam at a gauge pressure of 2.0 bar is...Ch. 7 - Prob. 7.33PCh. 7 - Prob. 7.34PCh. 7 - Prob. 7.35PCh. 7 - Prob. 7.36PCh. 7 - Prob. 7.37PCh. 7 - Prob. 7.38PCh. 7 - Prob. 7.39PCh. 7 - Prob. 7.40PCh. 7 - Prob. 7.41PCh. 7 - Jets of high-speed steam are used in spray...Ch. 7 - The following diagram shows a simpli?ed version of...Ch. 7 - Three hundred L/h of a 20 mole% C3H880 nC4H10gas...Ch. 7 - Air at 38°C and 97% relative humidity is to be...Ch. 7 - A mixture containing 65.0 mole% acetone (Ac) and...Ch. 7 - Superheated steam at T1(°C) and 20.0 bar is...Ch. 7 - Prob. 7.48PCh. 7 - Prob. 7.49PCh. 7 - Eight fluid ounces (1 qt = 32 oz) of a beverage in...Ch. 7 - Prob. 7.51PCh. 7 - Prob. 7.52PCh. 7 - Prob. 7.53PCh. 7 - Prob. 7.54PCh. 7 - Prob. 7.55PCh. 7 - Prob. 7.56PCh. 7 - Prob. 7.57PCh. 7 - Prob. 7.58PCh. 7 - Prob. 7.59PCh. 7 - Prob. 7.60PCh. 7 - Prob. 7.61PCh. 7 - Prob. 7.62PCh. 7 - Arsenic contamination of aquifers is a major...Ch. 7 - Prob. 7.64PCh. 7 - Prob. 7.65P
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