An open system is best characterized as a system in which:
a) energy can freely enter and leave, but matter cannot.
b) matter and energy can freely enter and leave.
c) matter can freely enter and leave, but energy cannot.
d) energy and matter cannot enter or leave.

B

Explanation:

A. Is wrong

This definition in this option does not fully define what an open system entails. It only gave a one sided definition of the phenomenon on ground

B is correct

In an open system, matter and energy should be free to leave

C is incorrect

This is clearly a one sided definition like A and should not be taken serious

D is incorrect

D is talking essentially about what a closed system is

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 :