Wood contains organic polymers such as long chains of cellulose (C₆H₁₀O₅)n, and is commonly used as abiofuel. Write a balanced equation for the complete combustion of one unit of the cellulose polymer to water and CO₂. Note that hydrogen and oxygen are already present in the ratio 2:1. Make a crude estimate of the enthalpy of combustion of cellulose by assuming that the conversion of the H and O to water does not contribute significantly, so that the energy content can be attributed entirely to the combustion of carbon. Compare your estimate to the true enthalpy of combustion of cellulose, 14.9 MJ/kg.