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 ▸Identify and explain the trend in atomic radius across a period
Forgot to put question for the interview
Why does the atomic radius of an atom decrease as you go across a period?
Cu2+ (aq) reacts with ammonia to form the complex ion [Cu(NH)3)4]2+. Explain this reaction in terms of acid-base theory, and outline the bonding in the complex formed between Cu2+ and NH3