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17 January, 13:49

Classify each of the following as an exothermic or an endothermic reaction:

a. C3H8 (g) + O2 (g) → CO2 (g) + H2O (g) + 2220 kj

b. 2 Na (s) + Cl2 (g) → 2 NaCl (s) + 819 kj

c. PCl5 (g) + 67kj → PCl3 (g) + Cl2 (g)

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Answers (2)
  1. 17 January, 15:05
    0
    Equation a. C3H8 (g) + O2 (g) → CO2 (g) + H2O (g) + 2220 kj

    is endothermic. + 2220 kj

    Equation b. 2 Na (s) + Cl2 (g) → 2 NaCl (s) + 819kJ

    is also endothermic since the overall energy change is positive. + 819kJ

    The equation c. PCl5 (g) + 67kj → PCl3 (g) + Cl2 (g) is endothermic since it requires anergy to proceed.
  2. 17 January, 15:08
    0
    Reaction A) is exothermic

    Reaction B) is exothermic

    Reaction C) is endothermic.

    Explanation:

    Hi, by definition an exothermic reaction is the one that generates heat as it occurs. An endothermic reaction on the other hand, consumes heat from the environment as it happens.

    This can be seen, when energy is put as a reactant in the equation. When it appears as a procuct the reaction is exothermic.

    Being all that said:

    Reaction A) is exothermic Reaction B) is exothermic Reaction C) is endothermic.
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