Question

) calculate the number of atom of
in each of following C Given:
Atomic mass of. I = 127 W.
a. 254 U of iodino (1)
b. 254 9 of iodine (1)
(Ans: 2 atoms, 1.2044 x 1024 atoms).​

Answer 1

Answer:

2 atoms, 1.2044 x 1024 atoms).

Explanation:

Given :-

Atomic mass of I = 127 u

To Find :-

No. of atoms in 254 u of Iodine

No. of atoms in 254 g of Iodine

Solution :-

( a )

No. of atoms = given mass / atomic mass

No. of atoms = 254/127 = 2 atoms.

------------------------

( b )

we know that,

Mass no. = atomic no.

Atomic no. of I = 127 u

-------------------------

Therefore, Molar mass = 127 g

No. of moles = 254/127 = 2

Now,

No. of atoms = no. of moles × Avogadro's no.

No. of atoms = 2× 6.022×10^24

No. of atoms = 12.046×10^23