Balanced equation: 10 CaCo3 + 20 HCl = 10 CaCl2 + H20 + 15 Co2
Answer: The standard cell potential (E∘) for the reaction 
is -0.121 V
Explanation:
The reaction is:
Relation between standard Gibbs free energy and equilibrium constant follows:
where,
= Standard Gibbs free energy = ?
R = Gas constant = 
T = temperature = 298 K
K= equilibrium constant = 
Putting values in above equation, we get:
To calculate standard Gibbs free energy, we use the equation:
Where,
n = number of electrons transferred = 1
F = Faradays constant = 96500 C
= standard cell potential = ?
Putting values in above equation, we get:
Thus standard cell potential (E∘) for the reaction is -0.121 V
The balanced chemical reaction is:
2KClO3 ----> 2KCl + 3O2
We are given the amount of oxygen gas to be produced from potassium chlorate. This will be the starting point for the calculations.
28.0 L O2 ( 1 mol / 22.4 L) (2 mol KClO3 / 3 mol O2) ( 122.55 g / 1 mol) = 102.13 g KClO3 is needed
What your question for number 3
Answer:
A. The molecular orbital theory of bonding is based on the mixing of atomic orbitals of similar shapes and energies to form molecular orbitals that extend to two or more atoms
Explanation:
When two atoms come close to each other, the waves of their atomic orbitals can interfere constructively or destructively, to form two new molecular orbitals that encompass the whole molecule.
B is wrong. It refers to Lewis structures.
C is wrong. It refers to VSEPR theory.
D is wrong. It refers to ionic bonding.
E. is wrong. It refers to valence bond theory.
