Which of the following is/are true? A in each period the atomic numbers increase from
left to right
b The periods are numbered 1 through 7 on the left-
hand side of the periodic table
C Elements in the same period have chemical
properties which are not all similar
d All of the above

Answer is D. All of the above

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 :

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).