Question

chemical bonds have bond enthalpies that describe how much energy is absorbed to break a bond and how much energy is released when that same bond is formed (the values are the same). the table shows the bond enthalpies for the different bonds found in the reaction ch₄ + 2 o₂ → co₂ + 2 h₂o.

bond\tenthalpy (kj/mol)
c - h\t413
o = o\t495
c = o\t799
o - h\t463

enter the correct values in the boxes.

total number of c - h bonds in the reactants:
total number of o = o bonds in the reactants:
total number of c = o bonds in the products:
total number of o - h bonds in the products:

Explanation:

Step1: Analyze reactant - $CH_4$

In $CH_4$, there are 4 C - H bonds.

Step2: Analyze reactant - $O_2$

There are 2 $O_2$ molecules, so the number of $O = O$ bonds is 2.

Step3: Analyze product - $CO_2$

In $CO_2$, there are 2 $C = O$ bonds.

Step4: Analyze product - $H_2O$

There are 2 $H_2O$ molecules, and each $H_2O$ has 2 O - H bonds, so the total number of O - H bonds is 4.

Answer:

Total number of C - H bonds in the reactants: 4
Total number of $O = O$ bonds in the reactants: 2
Total number of $C = O$ bonds in the products: 2
Total number of O - H bonds in the products: 4