Given that the nucleus of 18 8O 818O is formed by 8 protons and 10 neutrons, is the mass of a neutral atom of 18 8O 818O equal to the sum of the masses of 8 atoms of 11H11H and 10 neutrons? Recall that the mass of a proton is mp=1.007276ump=1.007276u and the mass of a neutron is mn=1.008665umn=1.008665u. The mass of a neutral atom of 11H11H is mH=1.007825umH=1.007825u. View Available Hint(s)

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 :