Question

calculate the number of atom in each of the following (given: atomic mass of I = 127.) a- 254u of iodine and b-254g of iodine .​

Answer 1

Answer:

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Answer 2

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.

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( b )

we know that,

Mass no. = atomic no.

Atomic no. of I = 127 u

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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* 6.02310^{24}

No. of atoms = 12.046*10^{23}