When The Equation C2H6 + O2 To CO2 + H2O Is Completely Class 11 ...

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Sign InWhen the equation ${{{C}}_2}{{{H}}_6} + {{{O}}_2} \to {{C}}{{{O}}_2} + {{{H}}_2}{{O}}$ is completely balanced using the lowest whole number coefficients, the sum of the coefficients will be:A. $4$B. $9.5$C. $19$D. $15.5$E. $11$

• CBSE

• Chemistry

• Grade 11

• Redox Reactions

Last updated date: 03rd May 2024•Total views: 378.6k•Views today: 10.78k AnswerStudy MaterialsNCERT Solutions For Class 11Important Questions for Class 11Revision Notes for Class 11NCERT BooksMaths Formula for Class 11Sample PapersClass 11 MathsClass 11 PhysicsClass 11 ChemistryClass 11 Business StudiesClass 11 EconomicsClass 11 AccountancySyllabusMaths SyllabusPhysics SyllabusChemistry SyllabusBiology SyllabusEnglish SyllabusHindi SyllabusAccountancy SyllabusBusiness Studies SyllabusEconomics SyllabusPolitical Science SyllabusPhysical Education SyllabusTextbook SolutionsClass 11 NCERT Exemplar SolutionsClass 11 HC Verma SolutionsClass 11 RD Sharma SolutionsClass 11 RS Aggarwal SolutionsClass 11 DK Goel SolutionsClass 11 TS Grewal SolutionsClass 11 Sandeep Garg SolutionsAnswerVerified378.6k+ viewsHint:The given reaction is a combustion reaction since the reactant is a hydrocarbon and it is burnt in the presence of oxygen. This produces carbon dioxide and water molecules. Based on the law of conservation of mass, the chemical equation is balanced.Complete answer:Law of conservation of mass states that both the reactants and products have the same mass. And in a chemical reaction, new mass cannot be created or it cannot be destroyed. Initially, we have to check the formula whether the reactants and products are correct or not. The coefficients are used to balance the elements. They are placed before each element or compounds. It is important to note that the subscripts near each element cannot be changed, since it is fixed. Moreover, the number of elements in reactants and products should be equal. Mass will be transferred from one substance to another. Now let’s focus on reactants first. The number of carbons is not the same as that in products. In the reactant side, there are two carbon atoms and in the product side, there is only one carbon atom. To balance, we have to multiply with $2$. There are six hydrogen atoms in LHS, while there are two hydrogen atoms in RHS. Thus multiplying with $3$, we can balance the hydrogen atoms. Now the equation becomes:${{{C}}_2}{{{H}}_6} + {{{O}}_2} \to 2{{C}}{{{O}}_2} + 3{{{H}}_2}{{O}}$There are two oxygen atoms in LHS and seven oxygen atoms in RHS. So we can multiply with $\dfrac{7}{2}$ to balance the oxygen atom. Now the equation is:${{{C}}_2}{{{H}}_6} + \dfrac{7}{2}{{{O}}_2} \to 2{{C}}{{{O}}_2} + 3{{{H}}_2}{{O}}$But it is given that coefficients are whole numbers. So multiply the whole equation with $2$, we get the balanced chemical equation. i.e. ${{2}}{{{C}}_2}{{{H}}_6} + 7{{{O}}_2} \to 4{{C}}{{{O}}_2} + 6{{{H}}_2}{{O}}$Now all the elements are balanced. When we add the coefficients, we get $2 + 7 + 4 + 6 = 19$Hence, the correct option is C. Note:The chemical equation can also be in ionic form. But, it has to be balanced by balancing mass and charge on the reactant and product side. We have to follow the law of conservation of charge also. Since the given chemical equation does not have any charge, we followed only the law of conservation of mass. Recently Updated PagesBasicity of sulphurous acid and sulphuric acid areThree beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurredWhat is the stopping potential when the metal with class 12 physics JEE_MainThe momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_MainHow do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSEIs H mCT and q mCT the same thing If so which is more class 11 chemistry CBSEBasicity of sulphurous acid and sulphuric acid areThree beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurredWhat is the stopping potential when the metal with class 12 physics JEE_MainThe momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_MainHow do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSEIs H mCT and q mCT the same thing If so which is more class 11 chemistry CBSE

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