Geologists have a rule of thumb: when molten rock cools and solidifies, crystals of compounds with the smallest lattice energies appear at the bottom of the mass because of high power of solubility. 
<h3>What is lattice energy? </h3>
The lattice energy is defined as the energy change upon the formation of one mole of crystalline ionic compound from its same constituent ions, that are assumed to be initially in the state of gases. It is also defined as measure of the cohesive forces which bind ionic solids together. 
As the lattice energy of the ionic compound increase the solubility of that particular compound decrease. Hence compound which have low lattice energy are more soluble than compound having high lattice energy. When molten rocks cools and solidified, the compound having smallest lattice energy become more soluble than crystals of compound which have large lattice energy. Therefore, crystal of compound with the smallest lattice energy start appearing at the bottom of the mass. 
Thus, we concluded that due to high solubility power of compound with low lattice energy appear at the bottom of the mass.
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Answer:
The answer to your question is given after the questions so I just explain how to get it.
Explanation:
a) 
Get the molecular weight of Phosphoric acid
         H₃PO₄ =  (3 x 1) + (31 x 1) + (16 x 4) 
                     = 3 + 31 + 64
                     = 98 g
          98 g -----------------  1 mol
       0.045 g ---------------   x
           x = (0.045 x 1) / 98
           x = 0.045 / 98
           x = 0.00046 moles or 4.6 x 10 ⁻⁴
b) 
Molarity = 
Molarity = 
Molarity = 0.0013 or 1.31 x 10⁻³
c) 
Formula             C₁V₁ = C₂V₂
                               V₁ = C₂V₂ / C₁
Substitution
                               V₁ = (0.0013)(1) / 0.01
Simplification and result
                               V₁ = 0.0013 / 0.1
                               V₁ = 0.13 l = 130 ml            
 
        
             
        
        
        
Answer:
alright that sounds like a recipe i gota try