The molar heat of combustion, A H, of sucrose is -5643.4 kJ mol . If 0.250 moles of sucrose is combusted in a heavy walled steel reactor, and the heat released by the reaction is allowed to be absorbed by the surroundings at 16°C, what is the change in entropy of the surroundings? i J/K Attempts: 0 of 1 used Submit Answer Save for Later

The molar heat of combustion, A H, of sucrose is -5643.4 kJ mol . If 0.250 moles of sucrose is combusted in a heavy walled steel reactor, and the heat released by the reaction is allowed to be absorbed by the surroundings at 16°C, what is the change in entropy of the surroundings? i J/K Attempts: 0 of 1 used Submit Answer Save for Later

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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During an adiabatic expansion the temperature of 0.440 mol of argon (Ar) drops from 69.0 °C to 10.0 °C. The argon may be treated as an ideal Part B gas. How much work does the gas do? Express your answer with the appropriate units. HẢ ? W = Value Units %3D Submit Request Answer Part C What is the change in internal energy of the gas? Express your answer with the appropriate units. HA ? U2 – U1 = Value Units Submit Request Answer
A cube of ice is taken from the freezer at -8.1°C and placed in a 91 g glass cup filled with 318 g of water. Both the water & the cup are at 23.3°C. Eventually the system reaches thermal equilibrium at 17.6°C. Determine Qcup, Qwater (for the water initially in the cup), Qice, & the mass of the ice. (note:use the images to find the specific heat and any additional information note conversion from grams to kilograms must be done) Qcup= Qwater= Qice= mass of ice=
27 of 42 (> Constants | Periodic Table A calorimeter is an insulated device in which a chemical reaction is contained. By measuring the temperature change, AT, we can calculate the heat released or absorbed during the reaction using the following equation: Consider the reaction C12 H22O11 (s) + 1202(g)-12CO2(g) + 11H2O(1) in which 10.0 g of sucrose, C12 H22011, was bumed in a bomb calorimeter with a heat capacity of 7.50 kJ/C. The temperature increase inside the calorimeter was found to be 22.0°C. Calculate the change in internal energy, AE, for this reaction per mole of sucrose. q= specific heat x mass x AT Or, if the calorimeter has a predetermined heat capacity, C, the equation becomes Express the change in internal energy in kilojoules per mole to three significant figures. 9=C x AT • View Available Hint(s) At constant pressure, the enthalpy change for the reaction, AH, is equal to the heat, gp, that is, V ΑΣφ ? AH= q, AE = kJ/mol but it is usualy expressed per mole of reactant and…
A sample initially containing 2.0 mol of liquid nitrogen (N2) in an expandable container at 77 K is heated at a constant pressure of 1.0 atm to 100 K. Calculate the value of q, w, AU, and AH for the process. Assume ideal gas behavior and ignore any liquid volumes. Include a simple sketch showing the energy flows and AU. Possibly useful information: C, = 29.1 J/(mol*K) AHvan for N2 = 5.56 kJ/mol N2 boiling point = 77 K
Is the answer 452 kJ or - 402 kJ
3. Calculate the heat of reaction (AHr, To) and adiabatic combustion temperature (Tad) of a fuel mixture (50 mol% octane + 50 mol% n-butane) burning with air at = 0.8, as following → C8H18 (g) + C4H10(g) +x (O2 + 3.76N2) aCO2 + bH2O + CO2 + dN₂
A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The cylinder is also submerged in a 1 atm pressure piston cylinder large insulated water bath. (See sketch at right.) water bath The temperature of the water bath is monitored, and it is determined from this data that 160. kJ of heat flows out of the system during the reaction. The position of the piston is gases also monitored, and it is determined from this data that the piston does 199. kJ of work on the system during the reaction. olo Ar exothermic Is the reaction exothermic or endothermic? endothermic up Does the temperature of the water bath go up or down? down neither in Does the piston move in or out? out neither absorb Does the reaction absorb or release energy? release neither How much energy does the reaction absorb or release? Be sure your answer…
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15 g of dimethylhydrazine and 15 g of nitrogen tetraoxide react at 30.2°C and at constant volume, releasing 159.2 kJ: a) Calculate, with this heat, what mass of ice, being initially at -23°C it can be heated up to 97.5°C b) Determine H of the reaction c) Determine the enthalpy of formation of liquid dinitrogen tetraoxide DATA: M- (g-mol ): AH + 718,84 = C(g) 213,34=CO,(g) = N(g) S740 = Cigrafito) s Hig) 205,u3 = 0,(e) Datos: H>O=18,02 (CHsJNNH=60,08 N:Oe=92,0 A,H"(H,e) = -285,83 kl-mol AH(H,0) - 6,025 kl-mol Dlealaces) (N-Hje 391 (C-N). 293 AH(CH))NNH, -61,92 kl-mol (C-H)- 413 AG (CO g)-394,36 (N-N) = 163 H,0.J) =75, 241 J. mal n GAT +472,10 + 217,97 SIH,O,R) 33, S8 ANSWER: a) 202,1 g b) -1940 kJ/mol c) -21.9 kJ/mol
A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The cylinder is also submerged in a 1 atm pressure piston cylinder large insulated water bath. (See sketch at right.) water bath The temperature of the water bath is monitored, and it is determined from this data that 156. kJ of heat flows out of the system during the reaction. The position of the piston is gases also monitored, and it is determined from this data that the piston does 128. kJ of work on the system during the reaction. | exothermic Is the reaction exothermic or endothermic? x10 endothermic up ? Does the temperature of the water bath go up or down? down neither in Does the piston move in or out? out neither absorb Does the reaction absorb or release energy? release neither How much energy does the reaction absorb or release? Be sure your answer…
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1.5 mole of solid lead (Pb) at 27°C is added to n mole of liquid Pb at 727°C at 1 atm pressure. Once the equilibrium is reached, we observed that the mixture is completely in liquid state at 527 °C. Using the data given below, calculate the mole amount of initial liquid Pb (i.e., n = ?). AH=4807 J/mole Tm = 327 °C Data for Pb: psolid = (5.63+2.33×10−³7) J/mole.K Cp liquid =(7.75–0.74×10−³7) J/mole.K Cp