common salt obtained from sea water contains 8.775 % NaCl by mass. what is the number of formula units of NaCl present in 25 gram of this salt

8.775 % by mass means 8.775 g of NaCl is present in 100 g sampleSo 25 g of the sample contains          = 8.775100 × 25         = 2.193 g of NaCl58.5 g of NaCl = Molecular mass = Avogadro no of particles = 6.022 × 1023 of NaCl unit cell2.193 g of NaCl contains = 2.19358.5  × 6.023 × 1023         = 2.258 × 1022 NaCl units

  • 47
What are you looking for?