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3 years ago

11

Which part of the periodic table contains elements with the greatest metallic properties?

1 answer:

KiRa [710]3 years ago

7 0

The bottom of group 1. Francium (or Fr) is the element with the greatest metallic properties.

Francium is not a naturally-occurring element, however. It is man-made. There is an isotope of francium that exists naturally, but it's half life is so short that it decays almost instantly into a different element.

The naturally-occurring element with the highest metallic properties is cesium (or Cs), located right above francium.

Metallic characteristics decrease as you move from left to right on the periodic table.

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3 years ago

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The vapor pressure of water is 23.76 mm Hg at 25 °C. A nonvolatile, nonelectrolyte that dissolves in water is sucrose. Calculate

MrRissso [65]

Answer : The vapor pressure of solution is 23.67 mmHg.

Solution:

As the relative lowering of vapor pressure is directly proportional to the amount of dissolved solute.

The formula for relative lowering of vapor pressure will be,

$\frac{p^o-p_s}{p^o}=\frac{w_2M_1}{w_1M_2}$

where,

$p^o$ = vapor pressure of pure solvent (water) = 23.76 mmHg

$p_s$ = vapor pressure of solution= ?

$w_2$ = mass of solute (sucrose) = 12.25 g

$w_1$ = mass of solvent (water) = 176.3 g

$M_1$ = molar mass of solvent (water) = 18.02 g/mole

$M_2$ = molar mass of solute (sucrose) = 342.3 g/mole

Now put all the given values in this formula ,we get the vapor pressure of the solution.

$\frac{23.76-p_s}{23.76}=\frac{12.25\times 18.02}{176.3\times 342.3}$

$p_s=23.67mmHg$

Therefore, the vapor pressure of solution is 23.67 mmHg.

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Eva8 [605]

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4 years ago

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