2. the relationship between a cathode and an anode involves

Answer is: electrons.

For example, balanced equation for the overall reaction:

C₂H₅OH + 3O₂ → 3H₂O + 2CO₂.

Galvanic cell has anode and cathode and half reactions are:

Anode reaction: C₂H₅OH + 3H₂O → 12H⁺ + 12e⁻ + 2CO₂; oxidation.

Cathode reaction: 3O₂ + 12H⁺ + 12e⁻ → 6H₂O; reduction.

Electrons are transported from anode to cathode.

"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"

1. they vary with a higher number because boiling is way hotter than melting