Homework answers / question archive / Question   #22 Use the VSEPR theory to predict the following about the GaCl43- molecule:     a) Electronic geometry:                     ____________________   b) Molecular geometry:                    ____________________   c) hybridized AO of center atom:      _____________________   d) polar or nonpolar:                          _____________________   #23 A 93

Question   #22 Use the VSEPR theory to predict the following about the GaCl43- molecule:     a) Electronic geometry:                     ____________________   b) Molecular geometry:                    ____________________   c) hybridized AO of center atom:      _____________________   d) polar or nonpolar:                          _____________________   #23 A 93

Chemistry

Share With

---

Question

 

#22 Use the VSEPR theory to predict the following about the GaCl43- molecule:

 

 

a) Electronic geometry:                     ____________________

 

b) Molecular geometry:                    ____________________

 

c) hybridized AO of center atom:      _____________________

 

d) polar or nonpolar:                          _____________________

 

#23 A 93.728 grams sample of compound ionized into one cation and three anions when dissolved in 125.214 grams of water. The freezing point of the resulting solution was found to be -6.26 °C. The freezing point constant of water is 1.86 °C /m. 

(a)       Calculate the concentration of dissolved solutes, in molality.

 

 

 

 

(b)       Calculate the molar mass of the solute, in grams/mole.

 

 

#17 An elementary reaction is as follows:       4 A (g) = (arrow) 3C (g) + 2 D (l)

A chemist found that in a 4.20 Liter container, the species C changed from 1.00 moles to 6.84 moles in 1.28 minutes during the synthesis. The rate of consumption for A in molarity per minute must be:

 

(a) -2.46                    (b) - 1.09                   (c) - 1.45                   (d) - 0.586 

 

 

 

 

20.     ( 5 pts.) The reaction between nitric oxide (NO) and chlorine (Cl₂) to form nitrosyl chloride (NOCl) was found to occur as an elementary reaction as follows:

2 NO (g) + Cl₂ (g) =(arrow) 2 NOCl (g)

A table of the concentrations and initial rates data is shown below:

[ NO ]₀ (M)                [ Cl₂ ]₀ (M)                 rate = - D[Cl₂]/ Dt (M / min)

Run 1                  0.10                           0.10                                  0.18

Run 2                  0.10                           0.20                                  0.36

Run 3                  0.20                           0.20                                  1.44

The order for Cl₂ in this reaction is:

 

(a) 1                           (b) 45                        (c) 2                           (d) 180

 

 

18.      (5 pts.) A 155.0 mL portion of aqueous phosphoric acid solution was completely neutralized by 45.38 grams of Lithium hydroxide. The chemical equation is:

3 LiOH (s) + H₃PO₄ (aq) =(arrow) Li₃PO₄ (s) + 3 H₂O (l)

The concentration of the phosphoric acid, in molarity, is:

(a) 4.075 M               (b) 1.611 M               (c) 11.40 M               (d) 3.942 M

 

X-ray crystallographic studies show that elemental palladium (Pd) exists in a face-centered cubic (fcc) crystal. The length of the sides for its crystalline unit cell was found to be 3.8907 Angstroms. The Mo Ka x-ray radiation used has a wavelength of 0.71354 Angstroms.   

(a)       Calculate the mass density, in grams / cm³, for palladium. (Hint: 1 Angstrom = 1 x 10^-8 cm, 1 amu = 1.661 x 10^-24 grams). 

 

 

 

(b)       Calculate the radius and diameter of the palladium atom, in Angstroms.

 

 

#24  Fill in the blanks with ( +, -, 0 ) for the value of each situation below:

 

 

Endothermic:

Exothermic:

Adiabatic :

 

Less Disorder:

Same Disorder:

More Disorder:

 

At equilibrium

Non-spontaneous:

Spontaneous: