Chemistry HW – please see attached sheet with Q 8 – 12

5 questions about mole and electron config.

 

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Need in12h – no extension given.

  

(c)

8 What volume of 0.150 M FeCl3(aq) solution is needed to react completely with 20.0 mL of 0.0450 M AgNO3(aq)?
What mass of AgCl will be formed? The net ionic reaction is: Ag+(aq) + Cl-(aq) AgCl(s) [6 marks]

9 When light of wavelength 231 nm shines on the surface of caesium metal, electrons are ejected with a maximum
kinetic energy of 5.2 x 10-19 J. Calculate: (a) the frequency (in s-1) of the light, (b) the binding energy of
electrons to the caesium metal, (c) the longest wavelength of light that will eject electrons. [5 marks]

10 Arrange the following in order of decreasing size (radius): Cl , K+, Cl, Br . Explain your rankings in terms of
quantum numbers and electrical (i.e., positive-negative) interactions. [3 marks]

11 The first four ionization energies of aluminium are as follows: Ei1=577 kJ mol
-1, Ei2=1817 kJ mol

-1, E i3=2745 kJ
mol-1, and Ei4=11578 kJ mol

-1. (i) Explain the trend in ionization energies. (ii) Which ion of aluminium has the
largest electron affinity? [2 marks]

12 (a) Write the electron configuration for the Mn and Mn2+ ground state, and give a set of quantum numbers for all
electrons in the least stable occupied orbital. (b) Is Mn2+ paramagnetic? Draw an orbital diagram to support your
answer. (c) What orbital is represented by the quantum numbers n = 4, l = 1? How many electrons can this
orbital contain? [6 marks]
(a)

(b) Paramagnetic? Y/ N (circle one)

(c)

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