Carbon occurs in two forms, graphite and diamond. Theenthalpy of the combustion of graphite is -393.5 kJ/moland that of diamond is -395.4 kJ/mol:C (graphite) + O2 (g) → CO2 (g)C (diamond) + 02 (g)AH1 = -393.5 kJCO2 (g)AH2 = -395.4 kJCalculate AH3 for the conversion of graphite to diamond:C (graphite)C (diamond)AH3 = ? kJ%3D

given, 1) combustion of graphite C (graphite) + O2(g) → CO2(g) , ΔH1 = -393.5 KJ -1 2)…

Answered: Carbon occurs in two forms, graphite…

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter5: Thermochemistry

Section: Chapter Questions

Problem 5.99QE

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The combustion of ethane, C2H6, has an enthalpy change of 2857.3 kJ for the reaction as written below. Calculate H for the combustion of 15.0 g of C2H6. 2 C2H6(g) + 7 O2(g) 4 CO2(g) + 6 H2O(g) rH=2857.3kJ/mol-rxn
A piece of titanium metal with a mass of 20.8 g is heated in boiling water to 99.5 C and then dropped into a coffee-cup calorimeter containing 75.0 g of water at 21.7 C. When thermal equilibrium is reached, the final temperature is 24.3 C. Calculate the specific heat capacity of titanium.
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 complete combustion of acetylene, C2H2(g), produces 1300. kJ of energy per mole of acetylene consumed. How many grams of acetylene must be burned to produce enough heat to raise the temperature of 1.00 gal water by 10.0c if the process is 80.0% efficient? Assume the density of water is 1.00 g/cm3
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A 250-g sample of water at 20.0C is placed in a freezer that is held at a constant temperature of 20.0C. Considering the water as the system, answer the following questions: a What is the sign of qsys for the water after it is placed in the freezer? b After a few hours, what will be the state of the water? c How will the initial enthalpy for the water compare with the final enthalpy of the water after it has spent several hours in the freezer? d What will the temperature of the water be after several hours in the freezer?
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One of the components of jet engine fuel is n-dodecane, C12H26(), which has a standard enthalpy of combustion of 8080.1 kJ/mol. (a) Write the thermochemical equation for the combustion of n-dodecane. (b) Use the standard enthalpies of formation in Appendix G to calculate the standard enthalpy of formation of n-dodecane.
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