Question

Find the freezing point of a solution containing 2 grams of naphthalene (C10H8) in 50 grams of benzene, if pure benzene freezes at 6 0C, and its kriscopic constant is 5.2?

Answer 1

Answer:

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Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.

Answer 2

Depression in the freezing point =ΔTf=5.45−3.55=1.9oC

Molar mass of C2H2Cl4=12×2+2×1+4×(35.5)=168 g/mol

The number of moles is the ratio of mass to molecular weight.

Number of moles of solute =1687.24=0.0431

The molality of solution is the number of moles of solute in 1000 g of water.

Molality =0.0431×1000/ 115.30 =0.374

Depression in the freezing point :

ΔTf=Kbm⟹1.9=Kb×0.374 

Kb=5.08oC/m