Standard Molar Enthalpies of Combustion Substance Combustion Reaction Enthalpy of Combustion, AH: kJ at 25 °C) mol carbon C(s) + O2(8) → CO2(g) -393.5 hydrogen H,(g) + 0,(g) → H, O() -285.8 magnesium Mg(s) + 0,(3) → MgO(s) -601.6 sulfur S(s) + O2(g) → SO2(g) -296.8 carbon CO(g) + 0,(g) → CO,(g) -283.0 monoxide methane CH4(8) + 202(8) → CO2(8) + 2H2O(1) -890.8 acetylene C2H2(g)+ 02(8) –→ 2C0,(g) + H2O(1) -1301.1 C,H5OH(1) +30,(8) → 2CO,(g)+ 3H,O(I) ethanol -1366.8 methanol CH3 OH(1) + CO2(g) + 2H2O(1) -726.1 C3H18(1) + 02(3) –→ 8CO,(g) + 9H2O(!) isooctane -5461 Table 5.2

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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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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From the data in the table, determine which of the following fuels produces the greatest amount of heat per gram when burned under standard conditions: CO(g), CH4(g), or C2H2(g).

Standard Molar Enthalpies of Combustion
Substance
Combustion Reaction
Enthalpy of Combustion, AH:
kJ at 25 °C)
mol
carbon
C(s) + O2(8) → CO2(g)
-393.5
hydrogen
H,(g) + 0,(g) → H, O()
-285.8
magnesium
Mg(s) + 0,(3) → MgO(s)
-601.6
sulfur
S(s) + O2(g) → SO2(g)
-296.8
carbon
CO(g) + 0,(g) → CO,(g)
-283.0
monoxide
methane
CH4(8) + 202(8) → CO2(8) + 2H2O(1)
-890.8
acetylene
C2H2(g)+ 02(8) –→ 2C0,(g) + H2O(1)
-1301.1
C,H5OH(1) +30,(8) → 2CO,(g)+ 3H,O(I)
ethanol
-1366.8
methanol
CH3 OH(1) +
CO2(g) + 2H2O(1)
-726.1
C3H18(1) + 02(3) –→ 8CO,(g) + 9H2O(!)
isooctane
-5461
Table 5.2
Transcribed Image Text:Standard Molar Enthalpies of Combustion Substance Combustion Reaction Enthalpy of Combustion, AH: kJ at 25 °C) mol carbon C(s) + O2(8) → CO2(g) -393.5 hydrogen H,(g) + 0,(g) → H, O() -285.8 magnesium Mg(s) + 0,(3) → MgO(s) -601.6 sulfur S(s) + O2(g) → SO2(g) -296.8 carbon CO(g) + 0,(g) → CO,(g) -283.0 monoxide methane CH4(8) + 202(8) → CO2(8) + 2H2O(1) -890.8 acetylene C2H2(g)+ 02(8) –→ 2C0,(g) + H2O(1) -1301.1 C,H5OH(1) +30,(8) → 2CO,(g)+ 3H,O(I) ethanol -1366.8 methanol CH3 OH(1) + CO2(g) + 2H2O(1) -726.1 C3H18(1) + 02(3) –→ 8CO,(g) + 9H2O(!) isooctane -5461 Table 5.2
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