Question

How many atoms are there in 18 grams of silver

Answer 1

Number of atoms=
`<strong>1.004* 10^(23)</strong>` atoms

Step-by-step explanation:

1 mole is the mass of substance which contain
`<strong>6.022* 10^(23)</strong>`

particles of that substance.Its symbol is 'n'.

Here the quantity
`<strong>6.022* 10^(23)</strong>` is called Avogadro number and it is denoted by
`<strong>N_(0)</strong>`.

Mass of the substance in grams is called is molar mass.It is denoted by'M'

Moles can be calculated by :

1)
`<strong>n=(given\ mass)/(molar\ mass)=(w)/(M)</strong>`

2)
`<strong>n=(Number\ of\ particles)/(Avogadro\ number)=(N)/(N_(0))</strong></p><p>`

compare 1) and 2) formula, we get

Put the values of w,M and

`<strong>N=(18)/(107.86)* 6.022* 10^(23)</strong>`

`<strong>N= 1.004* 10^(23)</strong>[tex]</p><p><strong>Hence Number of atoms of silver</strong>= [tex]<strong>1.004* 10^(23)</strong>` atoms