Question

Calculate the no. of each atoms presents in 10 grams of calcium carbonate.

Answer 1

Molar Mass of Calcium carbonate:-

`\\ \sf\longmapsto CaCO_3`

`\\ \sf\longmapsto 40u+12u+3(16u)`

`\\ \sf\longmapsto 52u+48u`

`\\ \sf\longmapsto 100u`

`\\ \sf\longmapsto 100g/mol`

• Given Mass=10g

`\boxed{\sf No\:of\;moles=(Given\:Mass)/(Molar\:Mass)}`

`\\ \sf\longmapsto No\:of\;moles=(10)/(100)`

`\\ \sf\longmapsto No\:of\:moles=0.1mol`

Now

`\boxed{\sf No\:of\:molecules=No\;of\:moles* Avagadro\: No}`

`\\ \sf\longmapsto 0.1* 6.023* 10^(23)`

`\\ \sf\longmapsto 6.023* 10^(22)molecules`