Which of the following is defined as the "heat change that takes place when 1 mole of a compound is formed from its elements in their stable states at standard temperature and pressure"?

The standard temperature and pressure is given at which of the following values?

The change in enthalpy of reaction can be defined as ____.

Which of the following thermochemical equation is an example that exhibits combustion?

A thermochemical equation shows that the resulting change in enthalpy is ΔH=-78kJ. What can we conclude from the value of the change in enthalpy?

Combustion of hydrocarbons are extremely exothermic reactions. which of the following is a by-product of combustion of hydrocarbons

This physical law states that: regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes.

Consider the following reactions below:

S(s) + 1/2 O2(g) → SO(g)              ΔH° = -140.0  kJ

SO2(g)  → SO(g) + 1/2 O2(g)         ΔH° = 295.5 kJ

Calculate ΔH° for the reaction: S(s)  + O2(g)  →  SO2(g)