Question

What mass of NaCl would contain the same number of chloride ions as 285 gm of MgCl2 ?

Answer 1

See you need to understand this.

Given mass of MgCl2 is 285 g

When divided by its molecular mass which is 95, 285/95 = 3 mole.

So 6 moles of chloride ions are present in 285g MgCl2.

Therefore in NaCl too, it will require 6 mole of chloride ion.

Since molecular mass of NaCl is 58.5.

So mass of NaCl required for same number of chloride ions as in MgCl2 will be 6*58.5 = 351g