What is the value of the equilibrium constant at 25 oC for the reaction between the pair: Fe(s) and Cr3 (aq) to give Cr(s) and Fe2 (aq). Give your answer using E-notation with NO decimal places (e. g., 2 x 10-2 would be 2E-2; and 2.12 x 10-2 would also be 2E-2.). Do NOT include spaces, units, punctuation or anything else silly! Use the reduction potentials for Cr3 (aq) is -0.74 V and for Fe2 (aq) is -0.440 V. [a]

The equilibrium constant is

Explanation:

   From the question we are told that

        The reduction potential of =

        The reduction potential of   =        

      In order for us to obtain the equilibrium constant we need to understand the process of the reaction

   At the cathode is reduced to Cr the reaction is  

   At the anode is oxidized to the reaction is

The net voltage of the cell is mathematically given as

  substituting value

Next we need to mathematically evaluate the  free energy of the cell as

where is the number of moles of  electron which is  6

           F is the farad constant with a value  

Substituting values

The equilibrium constant is mathematically represented as

Where R is the gas constant with value  8.314 J/mol

            T is the temperature with a given value of  

Substituting values

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).