Hof Signed
I have a chemistry question... What happens to the sign and magnitude of ΔH for some reaction if you reverse a?
What happens to the sign and magnitude of ΔH for some reaction if you reverse a reaction or if you double the number of moles of each constituent. What happens to ΔHof if you reverse the reaction or if you double the number of moles of each constituent.
if you flip the reaction around, the sign changes.
2 H2 + 1 O2 --> 2 H2O ... dHrxn = - X.. I don't know what X is..it's irrelevant though..
2 H2O ---> 2 H2 + 1 O2.. dHrxn = +X..
now.. that dHrxn is based on moles of something. you could read it as -X kJ/2 moles H2... -X kJ/1 mole O2. or +X kJ/2 moles H2O.
ok? if you have a different number of moles, you can calculate Q given off by your reaction like this...
150 moles H2 reacts with 75 moles O2..
Q = (150 moles H2) x (-X kJ/2 moles H2) = -75X kJ
and it also =
Q = (75 moles O2) x (-X kJ / 1 mole O2) = -75X kJ
see how that works?
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