Which coefficients balance the equation

Option A. 1, 1, 1, 2

Explanation:

_Na₂SO₄ + _BaCl₂ —> _BaSO₄ + _NaCl

To know which option is correct, we shall balance the equation. The equation given in the question above can be balanced as follow:

Na₂SO₄ + BaCl₂ —> BaSO₄ + NaCl

There are 2 atoms of Cl on the left side and 1 on the right side. It can be balance by writing 2 before NaCl as illustrated below:

Na₂SO₄ + BaCl₂ —> BaSO₄ + 2NaCl

Now, the equation is balanced.

The coefficients are: 1, 1, 1, 2

Thus, option A gives the correct answer to the question.

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