Given the incomplete equation representing a reaction: C_(3)H_(8)+5O_(2)arrow 3CO_(2)+underline ( )H_(2)O What is the coefficient of H2O when the equation is completely balanced using the smallest whole number coefficients? 1 2 4 8

To balance the equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation.Given the incomplete equation: Step 1: Balance the carbon atoms.There are 3 carbon atoms on the left side, so we need 3 carbon atoms on the right side. The coefficient for is already 3.Step 2: Balance the hydrogen atoms.There are 8 hydrogen atoms on the left side, so we need 8 hydrogen atoms on the right side. The coefficient for is 4.Step 3: Balance the oxygen atoms.There are 10 oxygen atoms on the right side (3 from and 4 from ), so we need 10 oxygen atoms on the left side. The coefficient for is already 5.Therefore, the coefficient of when the equation is completely balanced using the smallest whole number coefficients is 4.Answer: 4