3 years ago

The element X has 2 valence electrons. its is a

Chemistry

1 answer:

Lesechka [4]3 years ago

6 0

helium, beryllium, magnesium, calcium, strontium, barium, radium. i believe any of these are proper answers.

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A certain substance X has a normal freezing point of -6.4 C and a molal freezing point depression constant Kf= 3.96 degrees C.kg

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Answer: $1.0\times 10^2g$

Explanation:

Depression in freezing point is given by:

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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 (X)= 950 g = 0.95 kg

Molar mass of non electrolyte (urea) = 60.06 g/mol

Mass of non electrolyte (urea) added = ?

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Thus $1.0\times 10^2g$ urea was dissolved.

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3 years ago

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