Answer:
0.088mole
Step-by-step explanation:
Given parameters: 
Mass of the compound = 5.125g 
Unknown: 
Number of moles = ? 
Solution: 
To solve this problem, we need first find the molar mass of the given compound. 
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol 
 So;
 Number of moles = 
 =
 = 
 = 0.088mole
 = 0.088mole