Determine the number of ch2cl2 molecules in 25.0 g ch2cl2.determine the number of ch2cl2 molecules in 25.0 g ch2cl2.

Answer : The number of molecules of are,

Explanation : Given,

Mass of = 25 g

Molar mass of = 85 g/mole

First we have to calculate the moles of .

Now we have to calculate the number of molecules of .

As, 1 mole of contains number of molecules of

So, 0.294 mole of contains number of molecules of

Therefore, the number of molecules of are,

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