Why are there black lines on the spectra?

The black lines in the Sun’s spectrum are caused by gases on, or above, the Sun’s surface that absorb some of the emitted light. Every gas (such as helium, hydrogen, oxygen, and so on) has a very specific set of frequencies that it absorbs.

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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 :

i think the answer is terrae but not 100 percent sure. ▓▬▬ §