Final answer:
The student seems to confuse Hasselbach's triangle with Hess's law, which is a thermodynamic concept. Using Hess's law, one can calculate the enthalpy change for a reaction by manipulating and summing other thermochemical equations. The result is the enthalpy change for the formation of acetylene from carbon and hydrogen.
Step-by-step explanation:
The question asks about Hasselbach's triangle, but this seems to be a confusion with Hess's law in thermodynamics. The question provides a scenario where Hess's law is applied to the formation of acetylene from carbon and hydrogen. To use Hess's law, one must manipulate and combine thermochemical equations in such a way that the sum of these equations will yield the desired reaction while the sum of the enthalpy changes of these reactions will give the enthalpy change for the desired reaction.
Steps to Apply Hess's Law
- Identify the given thermochemical equations and the desired reaction.
- Reverse or multiply the given equations to align with the reaction components of the desired reaction.
- Add the manipulated equations. The stoichiometric coefficients will determine if an equation is multiplied by a factor or if a reaction is reversed (the sign of ΔH changes in the case of reversing).
- The sum of the enthalpy changes (ΔH) from the adjusted equations will give the ΔH for the desired reaction.
By following these steps, one could determine the enthalpy change for the formation of acetylene (C2H2) from carbon(s) and hydrogen(g).