1. Use the following reactions to determine the Delta Hrxn for P4O10(s) + 6H2O(l) 4H3PO4(l) 4P(s) + 5O2(g)---> P4O10(s). Delta H = -2984kJ 2H2(g) + O2(g)---> 2H2O(l) Delta H = -570kJ 2P(s) + 4O2(g) + 3H2(g)---> 2H3PO4(l). Delta H = -2534kJ B. Is the reaction exothermic or endothermic? C. Given Sof P4O10(s) = 228.9 J mol-1 K-1; Sof H2O(l) = 69.9 J mol-1 K-1; Sof H3PO4(l) = 241.98 J mol-1 K-1 calculate the DGrxn at 28.0oC. D. Is this reaction spontaneous or nonspontaneous?

1. Use the following reactions to determine the Delta Hrxn for P4O10(s) + 6H2O(l) 4H3PO4(l) 4P(s) + 5O2(g)---> P4O10(s). Delta H = -2984kJ 2H2(g) + O2(g)---> 2H2O(l) Delta H = -570kJ 2P(s) + 4O2(g) + 3H2(g)---> 2H3PO4(l). Delta H = -2534kJ B. Is the reaction exothermic or endothermic? C. Given Sof P4O10(s) = 228.9 J mol-1 K-1; Sof H2O(l) = 69.9 J mol-1 K-1; Sof H3PO4(l) = 241.98 J mol-1 K-1 calculate the DGrxn at 28.0oC. D. Is this reaction spontaneous or nonspontaneous?

Physical Chemistry

2nd Edition

ISBN:9781133958437

Author:Ball, David W. (david Warren), BAER, Tomas

Publisher:Ball, David W. (david Warren), BAER, Tomas

Chapter2: The First Law Of Thermodynamics

Section: Chapter Questions

Problem 2.88E: The following are values of heat capacity for nitrogen gas; Temp K Cv J/mol. K 300 20.8 400 20.9 500...

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The following are values of heat capacity for nitrogen gas; Temp K Cv J/mol. K 300 20.8 400 20.9 500 21.2 600 21.8 700 22.4 800 23.1 900 23.7 1000 24.3 1100 24.9 Using the general formula Cv = A BT C/T2, find values of A, B, and C that fit the given data.
Benzoic 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.
A pellet of benzoic acid standard was combusted in a bomb calorimeter to determine the experimental calorimeter constant. After 6 mins of monitoring the temperature, the bomb was fired. The following data were obtained. mole of benzoic acid: 0.0049 mol mass of burnt fuse wire: 0.0125 g qwire,surr: 5858 J/g ΔHcombustion of benzoic acid: -3228.0 kJ/mol Δng (combustion of benzoic acid): -0.5 mol R: 8.314 J/mol•K r1: 0ºC/min r2: 0ºC/min Tf: 30.4ºC Ti: 28.4ºC Determine the calorimeter constant (in J/ºC). Report your answer in 2 decimal places.
For the following combustion reaction of benzoic acid (HC7H5O2; molar mass = 122.1 g/mol) HC7H5O2(s) + 15/2 O2(g) --> 7CO2(g) + 3H2O(l); DHcomb = -3226 kJ 1.00 g of benzoic acid is combusted in a bomb calorimeter, which contains 1.00 kg of water (specific heat = 4.184 J/g.oC) and the bomb has a heat capacity of 890 J/oC. If the initial temperature of the calorimeter is 25.0oC, what is the final temperature of the calorimeter when the combustion is completed? (A) 51.8oC (B) 31.3oC (C) 30.2oC (D) 27.0oC
Calculate the enthalpy change for the reaction C(s) + 2H2 (g)--->CH4(g) from the following data. C(s) + O2 (g) ---> CO2(g). ΔH = – 393.5 kJ/mol H2(g) + 0.5 O2 (g) ---> H2O(l). ΔH = – 285.8 kJ/mol CH4(g) + 2 O2 (g)---> CO2(g) + 2 H2O(l). ΔH = – 890.2 kJ/mol
Given the following processes and their respective enthalpies in kJ/mol: Li(s) --> Li(g); DHs = +161 Li(g) --> Li+(g) + e–; IE1 = +520 F2(g) --> 2F(g); BE = +160 F(g) + e– --> F-(g); EA = -328 Li+(g) + F-(g) --> LiF(s); UL = x If the reaction: Li(s) + ½F2(g) --> LiF(s) has DHf= -616.0 kJ/mol, deduce the value of x for UL (lattice energy in kJ/mol) in LiF. (A) -1129 (B) -1049 (C) -183 (D) -103
A sample of methylhydrazine (rocket fuel) weighing 1.500 g was ignited in a bomb calorimeter initially at 25.0°C, producing a temperature rise of 10.215 K. Determine the internal energy (∆U) of combustion of methylhydrazine. a) To properly determine the internal energy of combustion methylhydrazine, the calorimeter was first calibrated. A 0.5000 g sample of sucrose (MW 342.296 g/mol)) was ignited under identical conditions and produced a temperature rise of 1.98 K. For sucrose, the internal energy combustion at constant volume, ∆U, is known to be –5616.64 kJ/mol. Calculate the calorimeter constant, in kJ/K. b) Using the calorimeter constant, determine ∆U, in kJ/mol, of combustion of the methylhydrazine (CH₆N₂, MW 46.10 g/mol).
Reaction: Combustion of CH4 with excess O2 mass = 1.6 g delta T = 1.3 oC heat capacity of bomb calorimeter = 11.3 kJ/ oC what is qrxn and delta Erxn?
A sample of solid biphenyl weighing 0.5260 g was ignited in a bomb calorimeter initially at 25.0°C, producing a temperature rise of 1.910 K. Determine the internal energy (∆U) of combustion. To properly determine the internal energy of combustion for the solid biphenyl, the calorimeter was first calibrated. a)A 0.7750 g sample of benzoic acid (C₆H₅COOH, MW 122.1 g/mol)) was ignited under identical conditions and produced a temperature rise of 1.940 K. For benzoic acid, the internal energy combustion at constant volume, ∆U, is known to be –3226 kJ/mol. Calculate the calorimeter constant, in kJ/K. b)using the caloremeter constant, determine triangleU, in KJ/mol, for the conbustion of solid biphenyl ((C6H5)2, MW 154.21 g/mol)
1. CaCO3(s) <--> CaO(s) + CO2(g) ΔH° = +178 kJ exo or endo - thermic remove mass(CaO) --> shift: __ (increase) P(CO2) shift? __ ... two ways to lose mass(CaCO3)? __________ higher T shift? __ 2. SO2(g) <--> (1/8)S8(s) + O2(g) ΔH° = +297 kJ exo or endo - thermic Δν(gas)= _, (increase)Vtot --> P(gas)_ > on _hs shift? __ (decrease)P(SO2) shift? __ ... two ways to make mass(S8)? ___________ lower T shift? __ 3. C(s) + 2H2(g) <--> CH4(g) ΔH° = –75 kJ exo or endo - thermic Δν(gas) = _, (decrease)Vtot -->P(gas)_ > on _hs shift? __ (increase)P(CH4) shift? __ ...two ways to to lose mass(C)? ___________ higher T shift? __
a) What is the standard enthalpy of reaction per mole of either HCl or NaOH when 50.00 cm3 of 0.1 moldm-3 of hydrochloric acid (HCl) and 50.00 cm3 of 0.1 moldm-3 of sodium hydroxide (NaOH) are mixed? According to your simulation, the temperature rose by 0.68 oC. (Density of water = 1gcm-3, Specific heat capacity of water = 4.18 J g-1 oC-1) Show your working below:
15 Calculate ΔGrxn in (kJ/mol) for the reaction for which ΔHrxn=-26.1kJ/mol ; ΔS=3.89J/molK at 25oC Group of answer choices A, -27.3 B, -24.9 C, 24.9 D, -26.2 E, 28.35 16.Using the values forΔH° and ΔS°provided in Appendix G calculate ΔG°rxn in (kJ/mole) for the following reaction. 2 C6H6(l) + 15 O2(g) →12 CO2(g) + 6 H2O(l) Group of answer choices A, -6290 B, -6404 C, -6390 D, -6505