Calculate the number of gold atom present in 0.6g of 18 carat gold (24 carat
gold is taken as 100%
where and amu of
gold in 197
Teacher's Signature.

The number of gold atom : 1.204 x 10²¹

Given

0.6 g of 18 carat gold

mass number of gold = 197

24 carat as 100% gold

Required

The number of gold atom

Solution

Percentage of gold in 18 carat :

Mass of gold in 0.6 g of 18 carat :

mol :

A mole is a number of particles(atoms, molecules, ions)  in a substance

1 mole = 6.02.10²³ particles  

So the number of gold atom :

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation: