Question

) (I) Write the postulates of Dalton's atomic theory.
( ii) Calculate the total number of moles in 0.5 85 gram of sodium chloride.
( Atomic mass of nitrogen=14u, H=1u, Cl=35.5u, Na= 23u)

Answer 1

Answer:

1) All matter is made of atoms.

2Atoms are indivisible and indestructible.

3) Compounds are formed by a combination of two or more different kinds of atoms.

4) A chemical reaction is a rearrangement of atoms

Explanation:

According to given data,

5.85 g of NaCl=

58.5

5.85

=0.1 moles of NaCl particle

Each NaCl particle contains 2 ions Na

+

and Cl

−

⇒ Total moles of ions =0.1×2 =0.2 moles

No. of ions =0.2×6.022×10

23

=1.2042×10

23

ions