A gas mixture composed of helium and argon has a density of 0.606 g/L at a 743 mmHg and 298 K. What is the composition of the mixture by volume

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 :

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.