4 gramos de cafe soluble, 20 gramos de azucar y agua hasta completar 200 ml, Calcula la concentración (%m/v) de todas las sustancias que forman el refresco

2 % de cafe, 20% de azucar, 100% de agua.

Explanation:

Un clásico problema de soluciones:

- Nuestros solutos son 4 g de cafe y 20 g de azúcar.

- en 200 mL de agua

Podemos asumir que los 200mL es el volumen de solución.

%m/v es un tipo de concentración que señala los gramos de soluto en 100 mL de solución.

% m/v de cafe →  (4/200) . 100 = 2 %

% m/v de azucar →  (20/200) . 100 = 20 %

Si tomamos al agua como sustancia que forma parte de la solución sería

(200/200) . 100 = 100 %

Lo que podríamos leer 100 g de agua en 100 mL de agua, dado que la densidad del agua es 1 g/mL

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.