If heat contents of CH4, C2H4 and C3H8 are -17.9, 12.5 and -24.8 kcal/mole respectively, than ΔH for the reaction CH4(g) + C2H4(g) ⇌ C3H8(g) will be _____________ Kcal?
Correct answer: A. -19.4
- A. -19.4
- B. -30.2
- C. 55.2
- D. -55.2
Explanation
Using ΔH = ΣH_products − ΣH_reactants gives −24.8 − [−17.9 + 12.5] = −19.4 kcal/mol. The negative value shows that the reaction is exothermic.
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