Finally, add up the O's on the right side and balance it by adding the appropriate coefficient on the O2. How To Balance Equations. This is a combustion reaction: a hydrocarbon react with the oxygen to give CO2 and H2O. Sometimes you need to multiply by 2 on the left using coefficients because of O2 being diatomic. The formula of this compound is C7H16. Read our article on how to balance chemical equations … On the right, there are 22 O's, so balance the equation by adding the coefficient of 11 on the left for the O2. Balance the reaction for the combustion of heptane: ?C7H16+?O2→?CO2+?H2O Enter the four coefficients in order, separated by commas (e.g., 1,2,3,4), where 1 … The combustion of methane in a laboratory burner is represented by the following equation: CH4 + 2 O2 > CO2 + 2 H2O Given the following three thermochemical equations: C + H2 > CH4 H=-74.87kJ C + O2 > CO2 H= -393.5 2 H2 + O2 > 2 . Noting that all the C is combined with O, balance the C first. For example, C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but XC2H5 + O2 = XOH + CO2 + H2O will. C7H16 + O2 → CO2 + H2O. If you do not know what products are enter reagents only and click 'Balance'. In many cases a complete equation … 1; 15; 7; 8. Source(s): I took chem. C7H16 + O2 → 7 CO2 + 8 H2O. The right side of this equation has 22 hydrogen atoms. A combustion reaction is generally defined as a reaction with atmospheric oxygen that produces carbon dioxide and water. You balanced the carbon and hydrogen right but there are 6 oxygens on one side and 22 oxygens making it incorrect. 2. 3. Since it's a combustion, it is an exothermic reaction C7H16 + 11O2 ---> 7CO2 + 8H2O CO2+? The formula for heptane is C7H16. The balanced equation is "C"_7"H"_16 + "11O"_2 → "7CO"_2 + "8H"_2"O. O2 !? You can use parenthesis or brackets []. Compound states [like (s) (aq) or (g)] are not required. Balance the equation ? The co- efficients are 1. C10H8 + 12O2 >> 10CO2 + 4H2O Start with the unbalanced equation: "C"_7"H"_16 + "O"_2 → "CO"_2 + "H"_2"O" A method that often works is to balance everything other than "O" and "H" first, then balance "O", and finally balance "H". Then all the H is combined into H2O so balance the H from left to right. > You follow a systematic procedure to balance the equation. For instance equation C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but PhC2H5 + O2 = PhOH + CO2 + H2O will; Compound states [like (s) (aq) or (g)] are not required. The balanced equation for the complete combustion of heptane is C7H16 + 11 O2 = 7 CO2 + 8 H2O. Input Equation Balanced Equation; CH3OH + O2 = CO2+H2O: 2CH3OH + 3O2 = 2CO2 + 4H2O: Cr+O2 = Cr2O3: 4Cr + 3O2 = 2Cr2O3: C3H5N3O9=O2+N2+CO2+H2O: 4C3H5N3O9 = O2 + 6N2 + 12CO2 + 10H2O To balance the carbon atoms, we need 7 CO2. H2O using the smallest possible integers. The correct balanced equation is actually C7H16 + 11O2 = 7CO2 + 8H2O. 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