1. the mass number of an isotope of element consists of the number of:

protons only

neutrons only

protons and neutrons added together

protons, neutrons and electrons added together
3 points saved

2. isotopes of the same element can differ based on the:

number of protons that is present

number of electrons that is present

number of neutrons that is present

overall charge of the atom

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 would be a gas formation