What is the expected freezing-point depression for a solution that contains 2.0 mol of KCI (electrolyte) dissolved in 1.0 kg of water? (K,- -1.86°C/m.)
a.-7.44 °C
C. +7.44 °C
b.-4.77 °C
d. +4.7 °C

a. -7.44 °C

Explanation:

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In this case, since the freezing point depression formula is:

Thus, since the Van't Hoff's factor is 2 for KCl as it ionizes in K⁺ and Cl⁻, the molarity is 2.0 m (2.0mol/1.0kg) and the freezing point depression constant is 1.86 °C/m, we calculate the freezing point depression as follows:

Therefore, the answer is a. -7.44 °C.

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the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.