Ascientist measures the rate of a reaction between two liquids. then he performs the reaction again, adding solid manganese. the reaction takes place more quickly the second time. the mass of the manganese decreased by 0.45 grams during the reaction. he claims that the manganese acted as a catalyst because it sped up the reaction. explain what is wrong with the scientists' reasoning.

The manganese is not functioning as a catalyst.

Explanation:

A substance that can be supplemented to a reaction to enhance the rate of a reaction without getting used up in the process is known as a catalyst. The catalysts generally accelerate the reaction by changing the mechanism of the reaction or by minimizing the activation energy.  

Thus, if the manganese is used as a catalyst then its mass would not have been decreased, and it would just continue to change the reaction unless and until it gets consumed. Therefore, manganese is not functioning as a catalyst.  

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.