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Using enthalpies of formation on our data table, which is closest to the enthalpy change for the reaction below?
CO (g) + H2O (g) → CO2 (g) + H2 (g)
Question 16 options:
| 41.2 kJ | |
| –745.8 kJ | |
| –41.2 kJ | |
| 745.8 kJ | |
| 524.8 kJ |
Expert Answer
Answer
HRxn = Hproducts – Hreactants
HRxn = (CO2 + H2) – (CO + H2O)
HRxn = (-393.5 + 0 ) – ( -110.5 – 241.8)
HRxn = -41.2 kJ
from the list
only -41.2 kJ is possible, choose C
