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You can use parenthesis or brackets []. For example, C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but XC2H5 + O2 = XOH + CO2 + H2O will. In many cases a complete equation will be suggested. CxHy + O2 -> xCO2 + (y/2)H2O. Hydrocarbon. When a hydrocarbon reacts with O2, CO2 and H2O are formed. How To Balance Equations. CxHy + (2x + y/2)O2 -> xCO2 + (y/2)H2O Hints for Balancing Equations - Balance an atom that occurs more than two times first. You can use parenthesis or brackets []. CxHy + O2 ---> CO2 + H2O. CxHy + O2 -> CO2 + H2O. CxHy + O2 ( CO2 + H2O. Combustion is the complete oxidation of an organic compound to produce CO2 and H2O. 2 C8H18 (l) + 25 O2 (g) ---> 16 CO2 (g) +18 H2O (g) is the balanced equation for the combustion of 2,3,4-trimethylpentane, and. H2O is different than H2O2 CH4 + 2O2 (CO2 + 2H2O. When 10 g of CxHy is burned, 45.00 g of products are formed (CO2 and H2O combined), what is the empirical formula of the fuel (CxHy + O2â CO2 + H2O)? 2Na + Cl2 ( 2NaCl. Now the equation is completely balanced. 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. So, if you start with C2H5OH + O2 --> CO2 + H2O and balance that equation, you get the one you wrote. ... You must not attempt to balance an equation by changing the subscripts in the chemical formula of a substance. 2Li + 2H2O ( 2LiOH + H2 . Read our article on how to balance â¦ CxHy + O2 -> xCO2 + H2O. Compound states [like (s) (aq) or (g)] are not required. Now there are 3*2 + 4*1 = 10 oxygen atoms on the right, so there must be ten oxygen atoms on the left taken two at a time: C3H8 + 5 O2 â 3 CO2 + 4 H2O. For example, C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but XC2H5 + O2 = XOH + CO2 + H2O will. Experimentally, you would take a known mass of ethanol and burn it completely, trapping and weighing the CO2 and H2O that are formed. ... -NEVER change a subscript to balance an equation (only use coefficients.-Changing a subscript changes the formula of the compound. Do not include states of â¦ CxHy (hydrocarbon) + O2 -> CO2 + H2O. C3H8 + O2 â 3 CO2 + 4 H2O. How To Balance Equations. Hydrocarbons are compounds that contain only C and H atoms. Write a balanced equation for the combustion of the following hydrocarbon, a high-octane component of gasoline. If you like, put the structure back into the equation: CH3CH2CH3 + 5 O2 â 3 CO2 + 4 H2O. 2Na3N ( 6Na + N2. Click hereðto get an answer to your question ï¸ 0.2 mol sample of hydrocarbon, CXHY yields after complete combustion with excess O2 gas, 0.8 mol of CO2 and 1.0 mol of H2O . Balance the reaction equation. Compound states [like (s) (aq) or (g)] are not required. Examples: Determine the type of reaction shown. 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