Question

Calculati caldura de vaporizare a unui mol e apa, cunoscand :
H2 (g) + 1/2 O2 (g)--> H2O(g) Δr H1 = - 241,8 kJ
H2 (g) + 1/2 O2(g)--> H2O (l) Δr H2= -285,8 kJ

Answer 1

H2O(l) ---> H2O(g)

∆H = ∆Hr1-∆Hr2 = -241,8+285,8 = 44 KJ/mol