contestada

Calcium carbide (CaC2) reacts with water to form acetylene (C2H2) and Ca(OH)2.
From the following enthalpy of reaction data and data in Appendix C, calculate ΔH∘f for CaC2(s):
CaC2(s)+2H2O(l)→Ca(OH)2(s)+C2H2(g)ΔH∘=−127.2kJ


ΔH∘f = kj?

Respuesta :

syed514
The answer is -60.57 = -60.6 KJ.
CaC2(s) + 2 H2O(l) ---> Ca(OH)2(s) +C2H2(g) H= -127.2 KJ
Hf C2H2 = 226.77
Hf Ca(OH)2 = -986.2
Hf H2O = -285.83
Now,

add them up. 226.77 - 986.2 + (2*285.83) = -187.77 
Add back the total enthalpy that is given in the question
 -187.77+127.2 = -60.57 

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