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- At night, almost all NOx is present as NO2. (Ie the NO/NOx concentration is very small). Explain whyComplete and balance the following chemical equations: MgO + H2O --> H2O + electron --> HOOH --(MnO2 catalyst)--> Li + H2O --> K + H2O --> HCl + NaOH -->Dodecane C12H26 is burned at constant pressure with 150% excess air. What is the air-fuel for this process.