The standard enthalpy changes of formation of iron (II) oxide, FeO(s), and aluminum oxide, Al2O3(s) are -266 kJ mol-1 and -1676 kJ mol-1 respectively. What is the enthalpy change under standard conditions for the following reaction? 3FeO(s) + 2Al(s) → 3Fe(s) + Al2O3(s)
Correct answer: C. -878 kJ mol-1
- A. +878 kJ mol-1
- B. -1942 kJ mol-1
- C. -878 kJ mol-1
- D. -2474 kJ mol-1
Explanation
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About Hess's Law
Hess's law states that the enthalpy change of a reaction is independent of the route because enthalpy is a state function. Calculations involve reversing and adding thermochemical equations, using standard enthalpies of formation or combustion, and finding an unknown reaction enthalpy without confusing enthalpy change with reaction rate.
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Combustion of graphite to form CO2 can be done by two ways. Reactions are given as follows: 1.C + O2 -> CO2 ∆H = -393.7 kJ mol-12.C + ½O2 -> CO ∆H = ?3.CO + ½O2 -> CO2 ∆H = -283 kJ mol-1What will be the enthalpy of the formation of CO?
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Hess's law is analogous to:
Hess's law states that the enthalpy change of a reaction