Write the net ionic equations and determine the standard potentials for the reaction of copper or zinc

The complete question is "Write the net ionic equations and determine the standard potentials for the reaction of copper or zinc with Tin (IV)"

1) Reaction of copper with Tin (IV)

Tin is in highest oxidation state which is +4. It cannot be oxidized further.

Therefore it will undergo reduction. The reduction half reaction can be written as

Using standard reduction potential table, we can find E⁰ red for this reaction.

E⁰ red = 0.15 V

Copper undergoes oxidation. The oxidation half reaction can be written as follows.

Standard reduction potential of Cu from the table is 0.34 V. But since this is an oxidation reaction we will reverse the sign of E⁰ to get E⁰ ox.

E⁰ox = -0.34 V

In order to write the net ionic equation, we will combine the above half reactions.

The net ionic equation is

Standard cell potential for this reaction is calculated as

E^{0}_{cell}= -0.19V

Cell potential for the reaction of copper with tin (IV) is -0.19 V

2) Reaction of zinc with tin (IV)

The reduction half reaction can be written as

As discussed in part 1 , E⁰red = 0.15 V

Zinc undergoes oxidation. The oxidation half reaction can be written as

Standard reduction potential of zinc from the table is -0.76 V.

Since we have an oxidation reaction here, we will reverse the sign to get E⁰ox

E⁰ox = 0.76 V

The net cell reaction is

Standard cell potential can be calculated as

The standard potential for the reaction of zinc with tin (IV) is 0.91 V

- 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

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"