Textbook Problem 4D.15

[Tracy Tran 3L]

4D.15: Determine the reaction enthalpy for the hydrogenation of ethyne to ethane, C2H2(g)+2H2(g)→C2H6(g), from the following data: ΔHc(C2H2,g)=−1300.kJ⋅mol−1, ΔHc°(C2H6,g)=−1560.kJ⋅mol−1, ΔHc°(H2,g)=−286kJ⋅mol−1.

Can someone explain to me what hydrogenation means? Would it be important information to know when writing out the equations of the given delta Hc values?

I've looked at the solutions manual and saw that they wrote out each equation for delta hc. How did they get these equations and what does delta hc mean?

[905749989]

Hydrogeneration is what it sounds like, the generation of hydrogen. If you look closely at the equation, you will notice a 'generation' of hydrogen in the product.

[Sara Shimabukuro 1A]

Hc is the standard enthalpy of combustion for each of the compounds. The way to solve this problem is to subtract the enthalpies of the reactants from the enthalpies of the products to get the reaction enthalpy.