Goose's law is an important basic law in thermochemistry. Some chemical reactions whose thermal effects are difficult to know, control and measure can be indirectly calculated by Goose's law. Therefore, how to use Gus's law to solve the problem is a key. Generally speaking, there are two ways to apply Gus's law: one is graphic method, and the other is algebraic operation method.
Extended data:
"Whether a chemical reaction is completed in one step or in multiple steps, its thermal effect is the same." It can be seen that Gass law is actually a further embodiment of the conclusion that "both internal energy and enthalpy are state functions". Using this law, we can calculate the thermal effect of a reaction that is difficult to measure or cannot be measured from the thermal effect of the reaction that has been accurately measured.
When applying this rule, we should pay attention to:
1, Goose's law only applies to isothermal isobaric or isovolumic processes, and the temperature of each reaction step should be the same;
2. The thermal effect is related to the nature of the substances involved in the reaction, the aggregation state, the number of substances that have completed the reaction, the reaction mode, temperature, pressure and other factors, which requires that all the reactions involved must be strict and complete thermochemical equations.
3. Non-volumetric work is not done in every step of the reaction.
4. The same substances involved should have the same aggregation state.
5. The reaction heat (△H) of chemical reaction is only related to the initial or final state of the reaction system, and has nothing to do with the reaction route.