Almost all chemical reactions absorb or release heat. this is because

..Chemical reactions involve the breaking and formation of chemical bonds. The breaking of the bonds is usually an endothermic process while the formation of bonds is usually an exothermic process. The net cumulative effect (the difference between the energy levels of products and products in the reaction) makes the reaction overall endothermic or exothermic.

i need mutiple choices

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 :