Use the following information: [[[[2H2(g) + O2(g) → 2H2O(l) ∆H = −572 kJ mol−1]]]] [[[[2H2(g) + O2(g) → 2H2O(g) ∆H = −484 kJ mol−1]]]] to calculate the enthalpy change for the process: H2O(g) → H2O(l)
Well the method I use for calculations in thermochemistry is a little different from the textbooks but is far easier to understand.
I would approach this question by drawing out the chemical equations in a pyramid shape and putting arrows in correct place with the right values next to it. Then explain what the question is asking you to find out and rearrange the arrows in order for the answer to be ascertained.
Draws diagram explaining it
LB
Related Chemistry IB answers
All answers ▸Why in a strong acid and strong bases reaction, a drop of acid added would not change its PH dramatically but has a big drop near the equivalent point?
Why is there a significant difference between the radii of first and second row transition metals, where as no difference (or even a decrease) is observed between the second and third rows?
Explain why the first ionization energy of sodium is less than that of magnesium?
Explain why average bond enthalpies can be used for cyclohexane but not for benzene