Question

Calculate the total number of moles in 0.585 gram of sodium chloride. (Atomic mass

of N=14u ,H=1u, Cl=35.5u & Na=23u.).​

Answer 1

Gram formula mass of NaCl=23+35.5=58.5g

58.5g of NaClhave ions=2×NA

0.585g of NaClhave ions=2×NA×(0.585g)(58.5g)=0.02×NA

=0.02×6.022×1023=1.20×1023ions