please can u help me out

Match the appropriate oxidation number to the element in red: 

SO42-                                              The P atom in PF5                                The Mg atom in MgF2

HSO3–                                             The Fe atom in FeO 

NH4+                                             The Cu atom in CuSO4
Na2S                                 The Mn atom in KMnO4
P4                                                  The Hg atom in HgCl2 

The Mn atom in KMnO4                                          

Calculate the standard cell potential for

Ags | Ag+aq || Fe2+aq | Fes

if the standard electrode reduction potentials are

Ag+aq | Ags = 0.799 V Fe2+aq | Fes = -0.409 V


The C atom in CCl4
 The Li atom in Li3
The Cr atom in CrCl3

The Cl atom in NaCl 
The C atom in CO2
The N atom in N2
The P atom in PF5

for  each of the following four reactions, select from the list (A – H) the half-reaction which shows the reduction of the oxidizing agent

3H2O(l) + P4(s) + 3KOH(aq) --> ” src=”http://loncapa.net/res/sfu/batchelo/Gallery/rarrow.gif” align=”middle”> 3KH<sub>2</sub>PO<sub>2</sub><i>(aq)</i> + PH<sub>3</sub><i>(g)</i><br />C<sub>2</sub>H<sub>4</sub>O<i>(aq)</i> + 2KOH<i>(aq)</i> + 2Ag(NH<sub>3</sub>)<sub>2</sub>NO<sub>3</sub><i>(aq)</i><img alt= ” src=”http://loncapa.net/res/sfu/batchelo/Gallery/rarrow.gif” align=”middle”> HC2H3O2(aq) + 2Ag(s) + 2KNO3(aq) + 2NH3(aq) + H2O(l)
4Au(s) + 16KCN(aq) + 3O2(g) + 6H2O(l) --> ” src=”http://loncapa.net/res/sfu/batchelo/Gallery/rarrow.gif” align=”middle”> 4KAu(CN)<sub>4</sub><i>(aq)</i> + 12KOH<i>(aq)</i><br />2H<sub>2</sub>SO<sub>4</sub><i>(s)</i> + Fe<i>(s)</i><img alt= ” src=”http://loncapa.net/res/sfu/batchelo/Gallery/rarrow.gif” align=”middle”> H2SO3(aq) + FeSO4(aq) + H2O(l)


Calculate the standard cell potential for

Fes | Fe2+aq || Ni2+aq | Nis

if the standard electrode reduction potentials are

Fe2+aq | Fes = -0.409 V Ni2+aq | Nis = -0.236 V


Match the appropriate oxidation number to the element in red: 
the P in          PO43-
the s in            K2SO3
the o in        Al2O3
the s    in         S8

the s in             SO2Cl2

 The Si atom in SiF4
 The Al atom in AlF3

The S atom in Na2SO4


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