Or a particular isomer of c 8 h 18 , the combustion reaction produces 5104.1 kj of heat per mole of c 8 h 18 ( g ) consumed, under standard conditions. c 8 h 18 ( g ) + 25 2 o 2 ( g ) ⟶ 8 co 2 ( g ) + 9 h 2 o ( g ) δ h ∘ rxn = − 5104.1 kj / mol what is the standard enthalpy of formation of this isomer of c 8 h 18 ( g ) ?

The standard enthalpy of formation of this isomer of is -220.1 kJ/mol.

Explanation:

The given chemical reaction is as follows.

The expression for the entropy change for the reaction is as follows.

Substitute the all values in the entropy change expression.

Therefore, The standard enthalpy of formation of this isomer of is -220.1 kJ/mol.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.