Calculate δh∘ in kilojoules for the reaction of acetylene (c2h2) (δh∘f=227.4kj/mol) with o2 to yield carbon dioxide (co2) (δh∘f=−393.5 kj/mol) and h2o(g) (δh∘f=−241.8kj/mol), a reaction which is supplied by the industrial gases industry for oxyacetylene gas welding and cutting due to the high temperature of the flame.

The value of for the reaction is, -2512.4 kJ

Explanation:

The chemical equation for the combustion of acetylene follows:

The equation for the enthalpy change of the above reaction is:

We are given:

Putting values in above equation, we get:

Therefore, the value of for the reaction is, -2512.4 kJ

answer; i believe that the correct answer is (a) potassium(k)

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.