A certain chip W used in a circuit of a micro computer has a mass of 5.68 milligram ,calculate the amount of W in the micro computer (W=28g/mol)

The amount of W : = 1.22 x 10²⁰

Given

5.6 mg of a micro computer

Required

The amount of chip

Solution

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

1 mole = 6.02.10²³ particles  

Can be formulated :

N = n x No

N = number of particles

n = mol

No = 6.02.10²³ = Avogadro's number

mass = 5.68 mg = 5.68 x 10⁻³ g

mol :

= mass : MW

= 5.68 x 10⁻³ g : 28 g/mol

= 2.03 x 10⁻⁴

The number of atoms :

= 2.03 x 10⁻⁴ x 6.02.10²³

= 1.22 x 10²⁰

sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.