Aside from gas composition, exhaled air is at a higher temperature than inhaled air as a result of being warmed by the body. 

Science

State one other way inhaled and exhaled air differ apart from in this gas compostion

Decomposition reactions are reactions in which one reactant breaks down at least two products. 

AB -> A + B

This may be because the reactant is energetically unstable under particular conditions. A decomposition reaction is spontaneous if it does not require an energy input for it to occur. 

Combustion reactions are exothermic reactions between reactants, usually a fuel and an oxidant. Common combustion reactions involve hydrocarbons. 

The general way of balancing hydrocarbon combustion reactions is: 

C(x)H(y) + (x + 0.25y)O2 -> xCO2 + (y/2) H2O

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