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"En mol plina A se vbrizga pri 25
C v togi reaktor s skupno konstantno prostornino 1,0 L in na zaetku vsebuje 2,0 mola tekoine B. Reaktor se zapre in naslednja kemijska reakcija poteka do konca, pri emer se sprosti 285 kJ toplote: A
(g)
+2 B
(tekoina)
3C
(s)
+2D
(g)
Ob zakljuku reakcije je temperatura v reaktorju 500 K. Molarne prostornine tekoine B pri 25
C in trdnega C pri 500 K sta 24 ml oziroma 14,2 ml. Kaj je H za ta proces? Enoto zapiite v kJ.(Namig: tlak tekoine B in trdne snovi C lahko domnevamo, da je zanemarljiv, kar pomeni, da sta tlaka pred in po reakciji doloena samo s plini, A oziroma D. Razvoj pomeni, da se je pri reakciji sprostila toplota. V Poleg tega, ker je podana molska prostornina B in C, prostornine, ki jo zasedajo, ne smemo zanemariti. Predpostavimo, da se plini obnaajo kot popolni plini in je plinska konstanta 8,3145 J/K mol.)"

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