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Question 7.16: In the reaction of 1 mole of solid carbon with oxygen gas, t...

In the reaction of 1 mole of solid carbon with oxygen gas, the energy of the carbon dioxide gas produced is 393 kJ lower than the energy of the reactants.

a.  Is the reaction exothermic or endothermic?

b.  Write the balanced chemical equation for the reaction, including the heat of reaction.

c.  Is the sign of ΔH positive or negative?

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a.  When the products have a lower energy than the reactants, the reaction is exothermic.
b.  C(s) + O_{2}(g) → CO_{2}(g) + 393  kJ                          c.  negative

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