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Anni [7]
3 years ago
12

What is happening in this diagram?

Chemistry
1 answer:
REY [17]3 years ago
4 0
Where and what is the diagram?
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How many grams of testosterone, C19H28O2 (288.4 g/mol), must be dissolved in 299.0 grams of benzene to reduce the freezing point
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Answer: 8.42 grams of testosterone

Explanation:

Depression in freezing point is given by:

\Delta T_f=i\times K_f\times m

\Delta T_f=0.500^0C = Depression in freezing point

i= vant hoff factor = 1 (for non electrolyte)

K_f = freezing point constant  of benzene= 5.12^0C/m

m= molality

\Delta T_f=i\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}\times \text{weight of solvent in kg}}

Weight of solvent (benzene)= 299.0 g = 0.299 kg

Molar mass of solute testosterone= 288.4 g/mol

Mass of solute testosterone added = ?

0.500=1\times 5.12\times \frac{xg}{288.4 g/mol\times 0.299kg}

x=8.42g

Thus 8.42 grams of testosterone must be dissolved in 299.0 grams of benzene to reduce the freezing point by 0.500°C.

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4 years ago
Based on results of his study of atomic x-ray spectra, Moseley discovered a relationship that replaced atomic mass as the criter
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