In the reaction C5H8 + O2 ➡ 8H2O + HCO2, what coefficient should be placed in front of O2 to balance the reaction? A. 5
B. 8
C. 9
D. No coefficient is needed

Equalization of chemical reactions can be done using variables. Steps in equalizing the reaction equation:  

•1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c, etc.  

•2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index (subscript) between reactant and product  

•3. Select the coefficient of the substance with the most complex chemical formula equal to 1  

For gas combustion reaction which is a reaction of hydrocarbons with oxygen produces CO₂ and H₂O (water vapor). can use steps:  

Balancing C, H, and the last O  

1. gives  a coefficient

C₅H₈+aO₂ ⇒ 5CO₂ + 8H₂O

O⇒left =2a, right= 5.2+8=18 ⇒ 2a=18⇒a=9

So the coefficient in front of O₂ = 9

But this reaction is not balanced because the number of H is not balanced (8 on the left and 16 on the right, but if we use this equation:

C₅H₈ + 7O₂⇒ 5CO₂ + 4H₂O

then the reaction will be balanced

one state would change   like louisiana to texas. thats a change

explanation:

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.