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Q.

What is the formula mass of NaCl? 
 

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a

58 u

b

35.5 u

c

23 u 
 

d

58.5 u

answer is D.

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Detailed Solution

As Cl in NaCl cannot exist in the solid state,  

we can only calculate its formula mass. The individual mass of sodium is 23 u, whereas that of chlorine is 35.5 u.  

Together the formula mass of Sodium chloride is the sum of individual masses, 23 + 35.5 = 58.5 u. 

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