Given the following two reactions and corresponding enthalpy changes, CO(g) + SiO2 (s) – SiO(g) + CO2(g) ΔΗ -+520.9 kJ 8 CO2(g) + Si3N4(s) → 3 SiO2(s) + 2 N20(g) + 8 CO(g) ΔΗ+461.05 k] compute the AH of the reaction 5 CO2(g) + Si3N4(s) → 3 SiO(g) + 2 N,O(g) + 5 CO(g)

Given the following two reactions and corresponding enthalpy changes, CO(g) + SiO2 (s) – SiO(g) + CO2(g) ΔΗ -+520.9 kJ 8 CO2(g) + Si3N4(s) → 3 SiO2(s) + 2 N20(g) + 8 CO(g) ΔΗ+461.05 k] compute the AH of the reaction 5 CO2(g) + Si3N4(s) → 3 SiO(g) + 2 N,O(g) + 5 CO(g)

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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(b) Calculate the enthalpy change for the reaction C(graphite) + 2 H2(g) → CH4(g) with the help of the enthalpy changes of the following reactions: C(graphite) + O2(g) → CO2(g) ∆H= -393.5 kJmol−1 H2(g) +1/2O2(g) → H2O(l) ∆H = -285.8 kJmol−1 CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l) ∆H = -890.4 kJmol−1 The temperature is 25 ◦C in all instances.
(b) An aqueous solution of acetic acid can be prepared by the reaction of ethanol with oxygen : CH3CH2OH (1) + O2 (g) –→ CH3COOH (1) + H2O (1) Write thermochemical equations for enthalpy of formation of the given compounds and calculate AH for the reaction, given the following data. Enthalpy of formation, AHf (kJmol") -277.8 Compound CH;CH2OH (1) CH3COOH (I) H2O (1) -485.0 -286.0
4) Given the data N2(8) + O2(8) 2 NO(8) AH = +180.7 kJ 2 NO(8) + O2(8) · 2 NO,(8) 2 N,0(8) – 2 N2(8) + O2(8) AH = -163.2 kJ AH = -113.1 kJ | use Hess's law to calculate AH for the reaction N20(8) + NO2(8) –→ 3 NO(8)
Find the molar enthalpy of combustion in kJ/mol of glucose at some temperature and pressure C6H12O6 (s) + 6 O2 (g) → 6 CO2 (g) + 6 H2O (l) given that in an experiment under the same conditions the combustion of 0.108 g of glucose raised the temperature of a calorimeter with total heat capacity C= 1.155 kJ/°C by 1.31 °C. The molar mass of glucose is 180.1 g/mol. Ignore the heat absorbed by the combustion products; assume this is negligible, and all heat went into the calorimeter itself. Give the answer with 5 or more significant figures.
Q.29. Determine, at 298 K, AH, the standard enthalpy of the reaction (1) between dinitrogen tetraoxide and hydrazine: (1) N204 (g) + 2 N2H4 (1) → 3 N2 (g) + 4 H20 (g) Knowing the standard reaction enthalpies, at 298 K, of the following reactions: (2) NH3 (g) 1/2 N2 (g) + 3/2 H2 (g); A2H° - + 46,19 kJ. mol (3) N204 (g) 2 NO2 (g); AgH-+ 58,04 kJ. mol- (4) 2 NH3 (g) > N2H (I) + H2 (g) ; AraH° = + 142,80 kJ. mol- (5) 2 NO, (g) + 4 H2 (g) → N2 (g) + 4 Hz0 (g) ; AsH = - 1 033,66 kJ. mol-
A chemist measures the enthalpy change AH during the following reaction: 4 Fe(s) + 3 02(g)→2 Fe,O3(s) AH =-320. kJ Use this information to complete the table below. Round each of your answers to the nearest kJ/mol. reaction ΔΗ x10 Fe(s) + 0,6) - Fe,0,(1) O kJ 2Fe,0; (s) – 4Fe(s) + 30, (3) O kJ 4Fe,0, (s) - 8Fe(s) + 60, (3)
2. Calculating enthalpy: AH = -206 kJ mol¹¹, 3 Fe(s) + 2 O₂(g) → Fe3O4 (S) AH = -136 kJ mol-¹, a) Given 2Fe(s) + 1.5 O₂(g) → Fe₂O3 (S) determine AH, for the following reaction: 4Fe₂O3(s) + Fe(s) → 3Fe3O4 (s) Is this reaction exothermic or endothermic? Is this enough information to inform whether this reaction occurs or not? O b) Given AH vap of water at 373 K = 40.7 kJ mol¹¹, C₂(l)=75.2 J mol¹¹K²¹ and ₂(g)=33.6 J mol¹¹K²¹, calculate AHvap of water at 298 K.
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The following table contains some standard enthalpies of formation, AH, at 298 K. Substance diamond graphite carbon tetrachloride carbon tetrachloride carbon tetrafluoride methane carbon monoxide carbon dioxide chlorine gas Cl₂ (g) hydrochloric acid fluorine gas hydrofluoric acid hydrogen oxygen water water hydrogen peroxide hydrogen peroxide ΔΗ (kJ/mol) 1.88 Formula C(s) C(s) 0 CCl4 (g) -106.7 CC14 (1) -139.3 CF4 (g) CH4 (g) -74.8 CO(g) -110.5 -679.9 CO₂(g) -393.5 0 HCl(g) -92.30 F2 (g) 0 HF (g) -268.61 H₂(g) 0 O2 (g) 0 H₂O(g) -241.82 H₂O(1) -285.83 H₂O2(g) -136.10 H₂O2 (1) -187.8
A chemist measures the enthalpy change AH during the following reaction: 2 KCl(s) + 302(g) →2 KClO3(s) AH=78. kJ Use this information to complete the table below. Round each of your answers to the nearest kJ. reaction ΔΗ ㅁ x10 2K C103 (s) → 2KC1(s) + 302(g) KCIO, (s)-KCI(s) + 0,(s) 3 KCI(s)+0, (g)KCIO, (s) kJ kJ 1 5
Given the standard enthalpy changes for the following two reactions: (1) 4C(s) + 5H₂(g) C4H10(9) (2) C₂H4(g) →→2C(s) + 2H₂(g) (3) 2C₂H4(g) + H₂(g) C4H10 (9) ΔΗ° = -125.6 kJ what is the standard enthalpy change for the reaction: KJ AHO = -52.3 kJ ΔΗ° = ?
（1）Consider the reaction: 2A (g) + 3 B (g) → 2 C (g) ΔHrxn = +254.3 kJ What will be the enthalpy change (in kJ) if 0.471 mol B reacts in excess A? （2）Consider the reaction: C (s) + O2 (g) → CO2 (g) ΔHrxn = -393.5 kJ What mass of carbon (in g) must be reacted via this mechanism to release 581.2 kJ of heat?