Question

In a sample of 200g of CaCO3,Calculate : 1)Total number of atoms.2)Total number of moles of carbon 3)total number of molecules.4)Number of gram atom of carbon .5) mass of calcium.6)Number of atoms of carbon​

Answer 1

Answer:

1) 2×[5×(6.02214076×10²³)] number of atoms are present.

2) 2 moles of Carbon.

3) 2×(6.02214076×10²³) is the number of molecules.

4) 2×12 i.e. 24g of Carbon atoms are present.

5) 2×40 i.e. 80g of Calcium is present.

6) 2×(6.02214076×10²³) number of atoms are present.

Explanation:

There are 5 atoms in CaCO3 [Ca+C+(3×O)]

1 mole = 6.02214076×10²³ atoms/molecules

100g of CaCO3 = 1 mole of CaCO3.

Therefore, 200g = 2 mole.

Number of moles of an atom in a molecule are same as the number of moles the molecule itself for the same amount of substance.

Molar mass of Carbon = 12g/mole.

Molar mass of Calcium = 40g/mole.