chemistry questions.. it would be great if you could show ur work!!!?

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Name the noble gas atoms that have the same electron configuration as the ions in the following compounds.
(a) aluminum sulfide, Al2S3
Al ion

S ion
(b) strontium fluoride, SrF2
Sr ion

F ion


Write the electron configuration for the following atom and for the simple ion that the element most commonly forms.
sodium, Z = 11

Calculate the number of moles of the indicated ion present in each of the following solutions.
(a) Na+ ion in 1.30 L of 0.205 M Na2SO4 solution
mol

(b) Cl - ion in 5.20 L of 0.10 M FeCl3 solution
mol

(c) NO3- ion in 120. mL of 0.57 M Ba(NO3)2 solution
mol

(d) NH4+ ion in 310. mL of 0.418 M (NH4)2SO4 solution
mol

What volume of 1.50 M NaOH is required to neutralize each of the following solutions?
(a) 23.0 mL of 0.170 M acetic acid, HC2H3O2
mL

(b) 33.4 mL of 0.114 M hydrofluoric acid, HF
mL

(c) 13.2 mL of 0.168 M phosphoric acid, H3PO4
mL

(d) 33.7 mL of 0.235 M sulfuric acid, H2SO4
mL

Suppose 48.6 mL of 0.250 M CoCl2 solution is added to 26.1 mL of 0.325 M NiCl2 solution. Calculate the concentration, in moles per liter, of each of the ions present after mixing. Assume that the volumes are additive.
Cl ion
mol/L
Co ion
mol/L
Ni ion
mol/L
 
Suppose 48.6 mL of 0.250 M CoCl2 solution is added to 26.1 mL of 0.325 M NiCl2 solution. Calculate the concentration, in moles per liter, of each of the ions present after mixing. Assume that the volumes are additive.

46.6 ml(0.250 mole/1000ml)=0.01215 mole

26.1 ml(0.325 mole/1000ml)=0.0084825 mole

0.01215 mole/((46.6+26.1)/1000))=0.1671 M CoCl2

0.0084825 mole/0.0727L=0.1167 M NiCl2
 
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