We can use Hess’s law to calculate enthalpy changes thatcannot be measured. One such reaction is the conversion ofmethane to ethylene:2 CH4(g) ------>C2H4(g) + H2(g)Calculate the ΔH° for this reaction using the following thermochemicaldata:CH4(g) + 2 O2(g) ------>CO2(g) + 2 H2O(l) ΔH° = -890.3 kJC2H4(g) + H2(g) ------>C2H6(g) ΔH° = -136.3 kJ2 H2(g) + O2(g)------>2 H2O(l) ΔH° = -571.6 kJ2 C2H6(g) + 7 O2(g)------>4 CO2(g) + 6 H2O(l) ΔH° = -3120.8 kJ
We can use Hess’s law to calculate enthalpy changes thatcannot be measured. One such reaction is the conversion ofmethane to ethylene:2 CH4(g) ------>C2H4(g) + H2(g)Calculate the ΔH° for this reaction using the following thermochemicaldata:CH4(g) + 2 O2(g) ------>CO2(g) + 2 H2O(l) ΔH° = -890.3 kJC2H4(g) + H2(g) ------>C2H6(g) ΔH° = -136.3 kJ2 H2(g) + O2(g)------>2 H2O(l) ΔH° = -571.6 kJ2 C2H6(g) + 7 O2(g)------>4 CO2(g) + 6 H2O(l) ΔH° = -3120.8 kJ
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 5.86QE: One of the components of jet engine fuel is n-dodecane, C12H26(), which has a standard enthalpy of...
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We can use Hess’s law to calculate enthalpy changes that
cannot be measured. One such reaction is the conversion of
methane to ethylene:
2 CH4(g) ------>C2H4(g) + H2(g)
Calculate the ΔH° for this reaction using the following thermochemical
data:
CH4(g) + 2 O2(g) ------>CO2(g) + 2 H2O(l) ΔH° = -890.3 kJ
C2H4(g) + H2(g) ------>C2H6(g) ΔH° = -136.3 kJ
2 H2(g) + O2(g)------>2 H2O(l) ΔH° = -571.6 kJ
2 C2H6(g) + 7 O2(g)------>4 CO2(g) + 6 H2O(l) ΔH° = -3120.8 kJ
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