Answer:
294.87 gm  CaCl_2
Explanation:
The computation of the  mass of calcium chloride is shown below:
But before that following calculations need to be done
Number of moles of chlorine atom is 
= 3.20 × 10^24 ÷ 6.022 × 10^23
= 5.314 moles
As we know that
1 mole CaCl_2 have the 2 moles of chlorine atoms
Now 5.341 mole chloride atoms would be 
= 1 ÷ 2 × 5.314
= 2.657 moles
Now 
Mass of CaCl_2 = Number of moles × molar mass of  CaCl_2
= 2.657 moles × 110.98 g/mol 
= 294.87 gm  CaCl_2
 
        
             
        
        
        
Mixtures can be classified as <u>homogeneous </u>or <u>heterogeneous</u>.
 
        
                    
             
        
        
        
Answer:
<h2>127.57 moles</h2>
Explanation:
To find the number of moles in a substance given it's number of entities we use the formula

where n is the number of moles 
N is the number of entities
L is the Avogadro's constant which is 
6.02 × 10²³ entities
From the question we have

We have the final answer as
<h3>127.57 moles</h3>
Hope this helps you