How many moles NaCl are there in 5.36 x 1023 formula units NaCl?

Answer 1

1 mol NaCl = 6.02 x 10²³ formula units NaCl

5.36 x 10²³ formula units NaCl x (1 mol NaCl / 6.02 x 10²³ formula units NaCl) = 0.890 mol NaCl (rounded to 3 significant figures)