Gfind the ∆hrxn for the reaction: 3c(s)+4h2(g) →c3h8(g) using these reactions with known ∆h’s: c3h8(g) + 5o2(g) → 3co2(g) + 4h2o(g) ∆h = −2043 kj c(s) + o2(g) → co2(g) ∆h = −393.5 kj 2h2(g) + o2(g) → 2h2o(g) ∆h = −483.6 kj

The for the reaction is -104.7 kJ.

Explanation:

Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.

According to this law, the chemical equation is treated as ordinary algebraic expressions and can be added or subtracted to yield the required equation. This means that the enthalpy change of the overall reaction is equal to the sum of the enthalpy changes of the intermediate reactions.

The chemical equation for the formation of propane follows:

The intermediate balanced chemical reaction are:

(1)    

(2)        ( × 3)  

(3)        ( × 2)  

The expression for enthalpy of the reaction follows:

Putting values in above equation, we get:

Hence, the for the reaction is -104.7 kJ.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

explanation: