Answer:
Explanation:
For each of these molecules, you must determine their VSEPR structure and then identify the strongest intermolecular forces.
Remember that water is a highly polar molecule.
a) CH₄
Electron geometry: tetrahedral
Molecular geometry: tetrahedral
Bond polarity: C-H bond nonpolar
Molecular polarity: nonpolar
Strongest IMF: London dispersion forces
Solubility in water: low
A nonpolar molecule is insoluble in a polar solvent.
b) CCl₄
Electron geometry: tetrahedral
Molecular geometry: tetrahedral
Bond polarity: C-Cl bond nonpolar
Molecular polarity: nonpolar (symmetrical molecule. All bond dipoles cancel)
Strongest IMF: London dispersion forces
Solubility in water: low
A nonpolar molecule is insoluble in a polar solvent.
d) PH₃
Electron geometry: tetrahedral
Molecular geometry: trigonal pyramidal
Bond polarity: P-H bonds are polar
Molecular polarity: polar (all P-H bond dipoles point towards P)
Strongest IMF: dipole-dipole
Solubility in water: soluble
A polar molecule is soluble in a polar solvent.
c) NH₃
Electron geometry: tetrahedral
Molecular geometry: trigonal pyramidal
Bond polarity: N-H bonds are highly polar
Molecular polarity: highly polar (all N-H bond dipoles point towards N)
Strongest IMF: hydrogen bonding
Solubility in water: highly soluble
NH₃ is so polar that it can form hydrogen bonds with water.
Answer:
b. 760 g
Explanation:
The mass of the solution = 800 g
5% of NaCl by mass of the solution can be determined as follows;
5% of 800 = × 800
= 5 × 8
= 40 g
The mass of NaCl in the solution is 40 g.
The mass of water = mass of solution - mass of NaCl
= 800 - 40
= 760 g
Therefore, the mass of water required is 760 g.