Textbook Question
If purple spheres represent iodine atoms, white spheres represent hydrogen atoms, and all the molecules are gases,
b. write a balanced equation for the reaction.
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5. Classification & Balancing of Chemical Reactions
Balancing Chemical Equations (Simplified)
Multiple Choice
Determine the total sum of the coefficients after balancing the following equation.
A
11.5
B
12
C
23
D
24
Verified step by step guidance1
Identify the chemical equation that needs to be balanced: C2H6 + O2 -> CO2 + H2O.
List the number of atoms of each element present in the reactants and products. For C2H6, there are 2 carbon (C), 6 hydrogen (H), and for O2, there are 2 oxygen (O). For CO2, there is 1 carbon and 2 oxygen, and for H2O, there are 2 hydrogen and 1 oxygen.
Start by balancing the carbon atoms. Since there are 2 carbon atoms in C2H6, place a coefficient of 2 in front of CO2 to balance the carbon atoms.
Next, balance the hydrogen atoms. There are 6 hydrogen atoms in C2H6, so place a coefficient of 3 in front of H2O to balance the hydrogen atoms.
Finally, balance the oxygen atoms. Count the total oxygen atoms needed on the product side: 2 CO2 contributes 4 oxygen atoms and 3 H2O contributes 3 oxygen atoms, totaling 7 oxygen atoms. Place a coefficient of 3.5 in front of O2 to balance the oxygen atoms. To avoid fractional coefficients, multiply all coefficients by 2 to get whole numbers, resulting in the balanced equation: 2 C2H6 + 7 O2 -> 4 CO2 + 6 H2O. Sum the coefficients: 2 + 7 + 4 + 6.
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