Use the References to access important values if needed for this question. The compound methanol, CH₂O, is a good fuel. It is a liquid at ordinary temperatures. When the liquid is burned, the reaction involved is 2 CH40(1) + 3 0₂ (9) 2 CO₂(g) + 4H₂O(g) The standard enthalpy of formation of liquid methanol at 25 °C is -238.7 k3 mol; other relevant enthalpy of formation values in k3 mol'¹ are: CH,O(9) = -200.7: COz(s) = -393.5; H2O(8) = -241.8 (a) Calculate the enthalpy change in the burning of 5.000 mol liquid methanol to form gaseous products at 25°C. State explicitly whether the reaction is endothermic or exotherma (b) Would more or less heat be evolved if gaseous methanol were burned under the same conditions? what is the standard enthalpy change for vaporizing 5.000 mol CH₂O() at 25°C? AH* = AH" = Calculate the enthalpy change in the burning of 5.000 mol gaseous methanol to form gaseous products at 25°C. AH" = k3
Use the References to access important values if needed for this question. The compound methanol, CH₂O, is a good fuel. It is a liquid at ordinary temperatures. When the liquid is burned, the reaction involved is 2 CH40(1) + 3 0₂ (9) 2 CO₂(g) + 4H₂O(g) The standard enthalpy of formation of liquid methanol at 25 °C is -238.7 k3 mol; other relevant enthalpy of formation values in k3 mol'¹ are: CH,O(9) = -200.7: COz(s) = -393.5; H2O(8) = -241.8 (a) Calculate the enthalpy change in the burning of 5.000 mol liquid methanol to form gaseous products at 25°C. State explicitly whether the reaction is endothermic or exotherma (b) Would more or less heat be evolved if gaseous methanol were burned under the same conditions? what is the standard enthalpy change for vaporizing 5.000 mol CH₂O() at 25°C? AH* = AH" = Calculate the enthalpy change in the burning of 5.000 mol gaseous methanol to form gaseous products at 25°C. AH" = k3
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter5: Principles Of Chemical Reactivity: Energy And Chemical Reactions
Section5.8: Product- Or Reactant-favored Reactions And Thermodynamics
Problem 1.1ACP: The standard enthalpies of formation of KNO3(s) and K2S(s) are 494.6 kJ/mol and 376.6 kJ/mol,...
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The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
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Transcribed Image Text:The compound methanol, CH₂O, is a good fuel. It is a liquid at ordinary temperatures. When the liquid is burned, the reaction involved is
2 CH40(1) + 3 0₂ (9) 2 CO₂(g) + 4H₂O(g)
Use the References to access important values if needed for this question.
The standard enthalpy of formation of liquid methanol at 25 °C is -238.7 kJ mol¹; other relevant enthalpy of formation values in k3 mol¹ are:
CH,O(0) = -200,7, CO (9) = -393.5; HyO(0) = -241.8
(a) Calculate the enthalpy change in the burning of 5.000 mol liquid methanol to form gaseous products at 25°C. State explicitly whether the reaction is endothermic or exothermic.
(b) Would more or less heat be evolved if gaseous methanol were burned under the same conditions?
What is the standard enthalpy change for vaporizing 5.000 mol CH₂O() at 25°C?
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AH* =
Calculate the enthalpy change in the burning of 5.000 mol gaseous methanol to form gaseous products at 25°C.
ΔΗ" =
AH =
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