Question

In the reaction of 1 mol of solid carbon with 1 mol of oxygen gas, the energy of the carbon dioxide gas produced is 394 kJ lower than the energy of the reactants.Is the reaction exothermic or endothermic?Write the balanced chemical equation for the reaction, including the heat of reaction.Is the sign of dH positive or nergative?

Answer 1

We have a combustion reaction, which is characterized by having fuel (C) and oxygen. They tell us that the reaction produces energy. When the reaction generates energy, the reaction is said to be exothermic and is expressed with a negative sign. The balanced equation of the reaction will be:

$C_{(s)}+O_{2(g)}\rightarrow CO_{2(g)}\text{ }\Delta H=-394kJ/mol$

The reaction is exothermic

The sign of dH is negative