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pav-90 [236]
3 years ago
7

In a chemical reaction that takes place at a fixed pressure and volume, the enthalpy change (ΔH) is –585 kJ/mol. Will this react

ion result in an increase or a decrease in temperature?
Chemistry
2 answers:
Molodets [167]3 years ago
5 0

by sign convention ΔH is negative it means an exothermic reaction where the heat is lose so the temperature decreases.

AlexFokin [52]3 years ago
5 0

Answer: Increase in temperature

Explanation:

Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and \Delta H for the reaction comes out to be positive. The energy is absorbed and hence the temperature of the surroundings decrease.

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and \Delta H for the reaction comes out to be negative. The energy is released and hence the temperature of the surroundings increase.

Thus with enthalpy change of -585kJ/mol , the tempearture increase.

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why was the mass lost when the reaction was done in the normal setup but stayed the same when it was done in the gas collection
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<h2>Answer : Law of conservation of mass</h2><h3>Explanation :</h3>

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In this case, when the reaction setup was done in normal way the mass was  lost in surrounding was not considered nor being calculated; whereas when the reaction was studied in a closed system where the gas was collected after the reaction the mass changes was noted down which helped to prove the point of law of conservation of mass and energy.

One can consider an example of soda can where the carbonated drink contains pressurized carbon dioxide gas. when opened the gas bubbles gets lost into the surroundings and we don't measure the mass changes. Instead if the soda can was opened in such a way where the gas evolved was measured then the mass changed would remain the same.

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