A solution has 500 mL and contains 0,5 moles of AlCl3. What is its molarity?

The molarity is: 1 M

Explanation:

We define molarity as an amount of moles in 1000ml of solution (1 liter)

500ml0,5 moles AlCl3

1000mlx= (1000ml  x 0,5 moles AlCl3)/500ml = 1 moles ACl3--> 1 M

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