Which represents the balanced double displacement reaction between sodium chloride (na+cl-) and copper sulfate (cu2+(so4)2-) ?

nacl + cu(so4) --> na2(so4) + cucl2

nacl + cu(so4) --> na(so4) + cucl

2nacl + cu(so4) --> na2(so4) + cucl2

nacl + cu(so4) --> cl(so4) + nacu

The balanced double displacement reaction is as follows.

Explanation:

The given reactant has sodium,chloride and copper sulfate ions.

In the double displacement reaction, two ionic compounds exchange their cations.

Sulphate and chloride ions are cations these are exchanged sodium and copper elements.

Hence, the balanced double exchange reaction is as follows.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3