How do you determine if a element/ion is an isotope(yes or no). For example, the question 39K
19
19 is the atomic number. I did my best to write it.

more info ? ? i don't understand what the question is

explanation:

your parents i think this could be it

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 :

you didnt put any of the following