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 ▸2HCl (aq)+CaCO3 (s)->H20(l)+CaCl2(aq)+CO2(g). If using 40cm^3 of 2.5mol.dm^-3 Hcl and 5.67g of CaCO3, determine the limiting reagent and how much CO2(g) could be theoretically produced by this reaction.
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 Sc3+(aq) is colourless, while Ni2+(aq) is green.