Question

which of the following is a combustion reaction?

c7h16(l) + 11o2(g) → 7co2(g) + 8h2o(g)

naoh(aq) + hcl(aq) → nacl(aq) + h2o(l)

6co2(g) + 6h2o(g) → c6h12o6(s) + 6o2(g)

c10h16(l) + 8cl2(l) → 10c(s) + 16hcl(aq)

Explanation:

Combustion reactions involve a substance reacting with oxygen (\(O_2\)) to produce carbon dioxide (\(CO_2\)) and water (\(H_2O\)).

• For \(C_7H_{16(l)}+11O_{2(g)}\to7CO_{2(g)} + 8H_2O_{(g)}\), it is a hydrocarbon (\(C_7H_{16}\)) reacting with \(O_2\) to form \(CO_2\) and \(H_2O\), which is characteristic of a combustion reaction.
• \(NaOH_{(aq)}+HCl_{(aq)}\to NaCl_{(aq)}+H_2O_{(l)}\) is an acid - base neutralization reaction (not combustion).
• \(6CO_{2(g)}+6H_2O_{(g)}\to C_6H_{12}O_{6(s)}+6O_{2(g)}\) is a photosynthesis - like reaction (not combustion).
• \(C_{10}H_{16(l)}+8Cl_{2(l)}\to10C_{(s)}+16HCl_{(aq)}\) is a reaction with \(Cl_2\) (not \(O_2\), so not combustion).

Answer:

\(C_7H_{16(l)}+11O_{2(g)}\to7CO_{2(g)} + 8H_2O_{(g)}\)