You titrate an unknown sample of oxalic acid (H2C2O4 (aq)) to determine its concentration. After noting the volume of the oxalic sample is 112.6 mL, you add a few drops of phenolphthalein indicator and titrate to the endpoint using 45.2 mL of a standardized 1.5 M NaOH solution. Find the molarity of the oxalic acid sample.

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 :