La presión de vapor del agua pura a 25 oC es 24,56 mmHg y la de agua de mar es 23,99 mmHg, y si suponemos que el agua de mar sólo contiene cloruro de sodio, calcula su concentración molal.

1.32m es la concentración de NaCl en el agua de mar

Explanation:

La disminución de presión de vapor sigue la ecuación:

P = XP⁰

Donde P es la presión de la solución = 23.99mmHg

X es la fracción molar del solvente

P⁰ la presión del agua pura = 24.56mmhg

23.99mmHg = X*24.56mmhg

0.97679 = X

La fracción molar del solvente se define como:

Moles Solvente / (Moles soluto + Moles solvente)

Asumiendo que las moles de soluto = NaCl = 1:

0.97679 = Moles solvente / (1 + Moles solvente)

0.97679 + 0.97679 Moles solvente = Moles solvente

0.97679 = 0.02321 moles solvente

42 moles solvente = 42 moles de agua.

masa de agua:

42 moles * (18.01g / mol) =758g de agua = 0.758kg

Molalidad, m, son las moles de soluto (1mol NaCl) por kg de solvente (0.758kg):

1mol / 0.758kg =

alfred von schlieffen, german army chief of staff, was given instructions to devise a strategy that would be able to counter a joint attack. in december, 1905, he began circulating what later became known as the schlieffen plan. schlieffen argued that if war took place it was vital that france was speedily defeated.

kuchisake

kuchisake-onna (口裂け女, "slit mouth woman ") is a malevolent figure appearing in japanese ghost stories, possibly dating back to the edo period. she takes the form of a masked woman who approaches people and asks them if they believe she is pretty.

explanation: