Midterm 2 Question 7

[Rhiana_Cayanan_2F]

Hello! So I got partial credit on Question 7 for Midterm 2, but I still want to understand how to solve this problem correctly. Could someone please explain how to answer the question?

[106268412]

Nitrogen is an ideal gas, so you use PV=nRT to find the number of moles given 5.45 L of N2, at 1.00 atm and 273 K. Make sure to use 8.206x10^-2 as the R value because of pressure given in atm. And you should get 0.243 as the moles, or n. Then for every 1 mol of N2 in the reaction, H is 180.6kJ, so you multiply 0.243 mols by 180.6 kJ and get 43.9 kJ as your final answer. Hope this helps!

[sophia_kwok_1I]

I first found the number of moles of N2 by using the ideal gas law (PV=nRT). Once I found the number of N2 moles, I multiplied the number by ΔH° that was given in the equation to find the heat absorbed.