CH() + 202e)Ceraphite) +O2(g) CO2()2H2+O2e)AH=-393.5 kJAH--571.6 kJAH=-890.4 kJ2H2O)->CO) + 2H;Ou)3. Calculate the standard enthalphy of acetylene (C2H2) form its elements:C:H)2C(graphite)++H2(s)The equations for each step are as follows:C(graphite) + O2(8)Hue) + Oe2C2He + 5O2e)CO2(s)AH =-393.5 kJAH=-285.8 kJ2.4CO2) + 2HOu)AH=-2598.8 kJ4. The standard enthalpy of formation of hexane can be determined indirectly. Calculate thestandard enthalpy of formation of hexane using the enthalpies of combustion (in kJ/mol)given just below.19AH=-4163.0 kJCH1406CO2) + 7H;Ou)+2.AH =-393.5 kJ%3DCO2e)Ceraphite) + O2(g)H2ie +O2e)AH =-285.8 kJH2Oay Date:Year & Section:Exercise 1:Problem Solving:Solve the following problems with complete solution1. Carbon occurs in two forms: graphite and diamond. Given the equation:CO2(e)CO2(e)Calculate the AH for the conversion of graphite to diamond:AH=-393.5 kJC(eraphite) + Ozig)C(diamond) + Ozg)%3DAH3-395.4 kJ->C(graphite)C(diamond)2. Calculate for the change in enthalpy of:C(eraphite) + 2H22)Given the following information:Cigraphite) + O2(e)2HM) + O2(g)CHe) + 202e)CH(e)AH=-393.5 kJCO2(e)2H;O)AH=-571.6 kJAH = -890.4 kJCO2e) + 2H2Ou)

"Dear student as you posted multiple different , as per guidelines we shall solve first question…

3. Calculate the standard enthalphy of acetylene (CH2) form its elements: CH2) 2C(graphite)+ H2() The equations for each step are as follows: C(graphite) + O2(8) H2e) + 2C2H+ 502(8) CO2() AH = -393.5 kJ AH=-285.8 kJ %3D %3D 2 4CO2+ 2HO) AH=-2598.8 kJ %3D 4. The standard enthalpy of formation of hexane can be determined indirectly. Calculate the standard enthalpy of formation of hexane using the enthalpies of combustion (in kJ/mol) given just below. 19 CH14(0) + 6CO) + 7H;Ou) AH = -4163.0 kJ -> 2 Ceruphite) + Oz(g) CO2(e) AH = -393.5 kJ > H2) +O2e) AH = -285.8 kJ ->

3. Calculate the standard enthalphy of acetylene (CH2) form its elements: CH2) 2C(graphite)+ H2() The equations for each step are as follows: C(graphite) + O2(8) H2e) + 2C2H+ 502(8) CO2() AH = -393.5 kJ AH=-285.8 kJ %3D %3D 2 4CO2+ 2HO) AH=-2598.8 kJ %3D 4. The standard enthalpy of formation of hexane can be determined indirectly. Calculate the standard enthalpy of formation of hexane using the enthalpies of combustion (in kJ/mol) given just below. 19 CH14(0) + 6CO) + 7H;Ou) AH = -4163.0 kJ -> 2 Ceruphite) + Oz(g) CO2(e) AH = -393.5 kJ > H2) +O2e) AH = -285.8 kJ ->

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter9: Energy And Chemistry

Section: Chapter Questions

Problem 9.50PAE: 9.50 When a 13.0-g sample of NaOH(s) dissolves in 400.0 mL of water in a coffee cup calorimeter, the...

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A piece of aluminum with a mass of 250. g is at an initial temperature of 5.0 C. If 24.1 kJ is supplied to warm the Al, calculate its final temperature. Obtain the specific heat capacity of Al from Table 4.1. Table 4.1 Representative Specific Heat Capacities
A 237-g piece of molybdenum, initially at 100.0 C, is dropped into 244 g of water at 10.0 C. When the system comes to thermal equilibrium, the temperature is 15.3 C. What is the specific heat capacity of molybdenum?
9.104 An engineer is using sodium metal as a cooling agent in a design because it has useful thermal properties. Looting up the heat capacity, the engineer finds a value of 28.2 J mol-l °C-l. Carelessly, he wrote this number down without units. As a result, it was later taken as specific heat. (a) What would he the difference between these two values? (b) Would the engineer overestimate the ability of sodium to remove heat from the system or underestimate it because of this error? Be sure to explain your reasoning.
9.53 Using these reactions, find the standard enthalpy change for the formation of 1 mol of PhO(s) from lead metal and oxygen gas. PbO(s)+C(graphite)Pb(s)+CO(g) H = 106.8 kJ 2C(graphite)+O2(g)2CO(g) H= -221.0 kJ If 250 g of lead reacts with oxygen to form lead(II) oxide, what quantity of thermal energy (in kJ) is ahsorhed or evolved?
The enthalpy of vaporization for water is 40.65 kJ mol-1. As a design engineer for a project in a desert climate, you are exploring the option of using evaporative cooling. (a) If the air has an average volumetric heat capacity of 0.00130 J cm-3 K-1, what is the minimum mass of water that would need to evaporate in order to cool a 5 m? 5 m room with a 3 m ceiling by 5°F using this method? (b) Is this a spontaneous or nonspontaneous process?
A 5.00-g sample of aluminum pellets (specific heat capacity = 0.89 J/C g) and a 10.00-g sample of iron pellets (specific heat capacity = 0.45 J/C g) are heated to 100.0C. The mixture of hot iron and aluminum is then dropped into 97.3 g water at 22.0C. Calculate the final temperature of the metal and water mixture, assuming no heat loss to the surroundings.
A student performing a calorimetry experiment combined 100.0 ml. of 0.50 M HCI and 100.0 ml. of 0.50 M NaOH in a StyrofoamTM cup calorimeter. Both solutions were initially at 20.0 C, but when the two were mixed, the temperature rose to 23.2 C (a) Suppose the experiment is repeated in the same calorimeter but this time using 200 mL of 0.50 M HCl and 200.0 ml of 0.50 M NaOH. WIII the AT observed be greater than, less than, or equal to that in the first experiment, and why? (b) Suppose that the experiment is repeated once again in the same calorimeter, this time using 100 mL of 1.00 M HCI and 100.0 ml. of 1.00 M NaOH. Will the T observed be greater than, less than, or equal to that in the first experiment, and why?
When 50.0 g of 0.200 M NaCl(aq) at 24.1 C is added to 100.0 g of 0.100 M AgNO3(aq) at 24.1 C in a calorimeter, the temperature increases to 25.2 C as AgCl(s) forms. Assuming the specific heat of the solution and products is 4.20 J/g C, calculate the approximate amount of heat in joules produced.
9.62 Sulfur trioxide can be removed from the exhaust gases of power plants hy reaction with lime. The relevant reaction is CaO(s)+SO4(g)CaSO4(s) , with H= -886 kJ. If 240 kg of SO3 is to be removed, how much heat is released?
Define the terms system and surroundings. What does it mean to say that a system and its surroundings are in thermal equilibrium?
Given 2Cr2O3(s)4Cr(s)+3O2(g)H=+2269.4kJ (a) What is the heat of formation of chromium(III) oxide? (b) What is H for the formation of 13.65 g of chromium (III) oxide?
A 20.0-g block of iron at 50.0C and a 20.0 g block of aluminum at 45C are placed in contact with each other. Assume that heat is only transferred between the two blocks. a Draw an arrow indicating the heat flow between the blocks. b What is the sign of qsys for the aluminum when the blocks first come into contact? c What will you observe when qsys for the iron is zero? d Estimate the temperature of the Al and Fe blocks when qsys of the iron equals qsys of the aluminum.