# Consider 1.60 g of naphthalene (C10H8) is dissolved in 20.0 g of benzene. The freezing point of benzene is 5.5oC, and the freezing point of the mixture is 2.8oC. What is the molal freezing point constant for benzene?

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Consider 1.60 g of naphthalene (C10H8) is dissolved in 20.0 g of

benzene. The freezing point of benzene is 5.5oC, and the freezing point of the

mixture is 2.8oC. What is the molal freezing point constant for benzene?

Consider 1.60 g of naphthalene (C10H8) is dissolved in 20.0 g of

benzene. The freezing point of benzene is 5.5oC, and the freezing point of the

mixture is 2.8oC. What is the molal freezing point constant for benzene?

##### 1 Answer

Your experimental molal freezing point depression constant for benzene is

#### Explanation:

The formula for calculating freezing point depression is

#color(blue)(|bar(ul(color(white)(a/a) ΔT_"f" = K_fm color(white)(a/a)|)))" "#

where

We can rearrange the above formula to get

#K_"f" = (ΔT_"f")/m#

The actual value of

Are you sure that the observed freezing point wasn't 2.3 °C?