What is the mass (in grams) of 4.5 x 10^23 units of NaCl?

could you also explain?

43.7 g

Explanation:

unit mass of NaCl = (23 + 35.5) u = 58.5 u

58.5 is the mass of one unit formula of NaCl (since NaCl is not a molecular compound)

1 u = 1.661×10^-24 g

if 1 unit formula of NaCl has 58.5 u, then 4.5×10²³ units of NaCl will have:

58.5 u × (1.661×10^-24 g/1 u) × 4.5×10²³ = 43.7 g

the answer is:  

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