Monday, January 30, 2017

thermodynamics - What is the difference between enthalpy (H) and heat (q)?


It seems that in some cases it's the same (that is, ΔQp=ΔH) yet in others they differ. For example, 2HX2(g)+OX2(g)2HX2O(l)ΔH=572 kJ



The answer for one mole of HX2O produced is 572×0.5 kJ. Is this under the assumption of constant pressure? Therefore it's ΔQp=ΔH?




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periodic trends - Comparing radii in lithium, beryllium, magnesium, aluminium and sodium ions

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