We need two pieces of information to calculate the reduction of the
vapor pressure of the solvent in a solution containing a nonvolatile
nonelectrolyte:
<span>
<span>The mole fraction of the
nonvolatile solute, Xsolute, in the solution.</span>
<span>The vapor pressure of the
pure solvent, Psolv.</span>
</span>
Psoln = Psolvent (1- Xsolute)
Xsolute = (100g /342.3 g/ mol) / ( 100g
/342.3 g/ mol) + (250 g/ 18 g/ mol)
X solute = 0.0206
P soln = (23.8 mmHg) (1- 0.0206)
Psoln = 23.31 mmg Hg
<span> </span>
<span>Beryllium
This is because it is in a group where Alkaline earth metals are but does not exhibit true properties of elements in that group as It exhibits amphoteric properties showing both the properties of a base and that of an acid.</span>
Letter D ,because algae is food for fish (natural)
It increases
The attractive force between the nucleus and the electrons INCREASES if the proton number increases while the number of energy levels remains constant.
Explanation:
Remember that protons carry a positive charge while electrons carry a negative charges. Unlike charges attract while like charges repel. An increase in the number of protons increases the positive charge of the atomic nucleus. This means that the force of attraction on the electron cloud of the atom increases.
This is why the atomic radius of atoms decreases across a period (from left to right) as the mass number of the atoms increase (while the number of electron orbitals remains the same across the period).
Learn More:
For more on the atomic radius check out;
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