Be sure to answer all parts. consider the following reaction: cd(s) + fe2+(aq) → cd2+(aq) + fe(s) e o (fe2+ / fe) = −0.4400 v, e o (cd2+ / cd) = −0.4000 v calculate the emf for this reaction at 298 k if [fe2+] = 0.80 m and [cd2+] = 0.010 m. e = v will the reaction occur spontaneously at these conditions? yes no cannot predict

EMF = -0.17 V

No

Explanation:  

For the reaction :

Cd(s) + Fe2+(aq) → Cd2+(aq) + Fe(s)

we will be using the Nersnt equation to calculate Ecell:

Ecell =  Eº -0.0592 V/2 ln Q

where Q = ( Fe⁺² )/ (Cd²⁺)

and (Fe²⁺) and (Cd²) are the molar concentration of Fe²⁺ and Cd²⁺

Reduction

Fe²⁺ + 2e⁻  ⇒ Fe(s)      Eº red = -0.4400 V

Oxidation

Cd (s)   ⇒ Cd²⁺ + 2e⁻    Eº ox = +0.4000 V

Eºcell = Eox + Ered = 0.4000 V + (-0.4400 V) = -0. 0400 V

Ecell = Eº -0.0692 V/2 ln Q = -0.0400 V - 0.0592/2 ln ( 0.80/0.010 ) = -0.17V

No because Eºcell is negative and  ΔºG will be positive since

                               ΔºG  =  -nFEºcell

b..

is the correct one

explanation:

covalent bonds form as valence electrons are shared between two atoms. lewis structures and structural formulas are common ways of showing the covalent bonding in organic molecules. formal charge describes the changes in the number of valence electrons as an atom becomes bonded into a molecule.