calculate the number of atom in each of the following (given atomic mass of I=127 u
a. 254 u iodine (I)
b. 254 g iodine (I)
Answers
Answer:
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* 6.023
No. of atoms = 12.046*
Answer:
2 mol and 1.2044×10^24atoms
Explanation:
a)..molar mass of iodine =127g/mol
number of mols =Mass of substance / molar mass of substance
=254g/127g/mol=2mol
b).. number of atoms= Number of moles×avagadro's number
=2mol×6.022×10^23 atom
=12.044×10^24atoms
=1.2044×10^23 atoms