Consider the following reaction: 2Mg(s) + O2(g) →2MgO(s), AH=-1204 kJ endothermic Submit Previous Answers Part B Correct https://www.chegg.com/ho Since the enthalpy of the reaction is given, examine its sign. A negative value indicates that the system (this reaction) releases energy to the su therefore, this reaction is exothermic. If the enthalpy of reaction were positive, indicating that the system absorbed energy from the surroundings would be endothermic. Calculate the amount of heat transferred when 3.59 g of Mg(s) reacts at constant pressure. Express your answer in kilojoules to three significant figures. ΔΗ ΤΟ ΑΣΦ Submit Request Answer Part C ? kJ How many grams of MgO are produced during an enthalpy change of -232 kJ ? Express your answer in grams to three significant figures. m= ΤΟ ΑΣΦ Submit Request Answer g Part D t D How many kilojoules of heat are absorbed when 40.7 g of MgO(s) is decomposed into Mg(s) and O2(g) at constant pressure? Express your answer in kilojoules to three significant figures. AH- ΓΝΟ ΑΣΦ CC? kJ
Consider the following reaction: 2Mg(s) + O2(g) →2MgO(s), AH=-1204 kJ endothermic Submit Previous Answers Part B Correct https://www.chegg.com/ho Since the enthalpy of the reaction is given, examine its sign. A negative value indicates that the system (this reaction) releases energy to the su therefore, this reaction is exothermic. If the enthalpy of reaction were positive, indicating that the system absorbed energy from the surroundings would be endothermic. Calculate the amount of heat transferred when 3.59 g of Mg(s) reacts at constant pressure. Express your answer in kilojoules to three significant figures. ΔΗ ΤΟ ΑΣΦ Submit Request Answer Part C ? kJ How many grams of MgO are produced during an enthalpy change of -232 kJ ? Express your answer in grams to three significant figures. m= ΤΟ ΑΣΦ Submit Request Answer g Part D t D How many kilojoules of heat are absorbed when 40.7 g of MgO(s) is decomposed into Mg(s) and O2(g) at constant pressure? Express your answer in kilojoules to three significant figures. AH- ΓΝΟ ΑΣΦ CC? kJ
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter9: Energy And Chemistry
Section: Chapter Questions
Problem 9.101PAE
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Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
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:Consider the following reaction:
2Mg(s) + O2(g) 2MgO(s), AH = -1204 kJ
endothermic
Submit
Previous Answers
Part B
Correct
C https://www.chegg.com/hom
Since the enthalpy of the reaction is given, examine its sign. A negative value indicates that the system (this reaction) releases energy to the sux
therefore, this reaction is exothermic. If the enthalpy of reaction were positive, indicating that the system absorbed energy from the surroundings
would be endothermic.
Calculate the amount of heat transferred when 3.59 g of Mg(s) reacts at constant pressure.
Express your answer in kilojoules to three significant figures.
AH =
Ο ΑΣΦ
Submit
Request Answer
Part C
二?
kJ
How many grams of MgO are produced during an enthalpy change of -232 kJ ?
Express your answer in grams to three significant figures.
Ο ΑΣΦ
Submit
Request Answer
Part D
2¢
?
g
How many kilojoules of heat are absorbed when 40.7 g of MgO(s) is decomposed into Mg(s) and O2(g) at constant pressure?
Express your answer in kilojoules to three significant figures.
AH =
ΓΕ ΑΣΦ
C?
kJ
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