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
The explanation for this question will be added soon.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Practise Thermochemistry and Energetics of Chemical Reactions
729 free Thermochemistry and Energetics of Chemical Reactions MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Hess's Law questions
Hess's law is analogous to:
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?
Standard enthalpy of combustion of graphite at 25 °C is -393.51 kJ mol-1 and that of diamond is -395.41 kJ mol-1. The enthalpy change for graphite is:
The net enthalpy change in a chemical reaction is same whether it is brought about in two or more different ways in one or several steps. It is known as:
The net heat change in a chemical reaction is smae weather it takes place in one ste or several steps. This law is known as:
The net heat change in a chemical reaction is the same whether it is brought about in two or more different ways in one or several steps. This is known as: