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
Answers
Answer:
a) 2 atoms
b) 12.046*10^24 atoms
Explanation :
We know from the question that the atomic mass of Iodine is given as 127u.
( a ) We know the formulae to find the number of atoms which is given mass / atomic mass of that element.
So, the number of atoms will be 254/127 = 2 atoms.
( b )
Since,we know the Molar mass which is 127 g.
Hence, the number of moles will be 254/127 = 2.
Therefore, the number of atoms will be no. of moles × Avogadro's no.
So, the number of atoms = 2*6.022*10^23
Number of atoms will be 12.046*10^23.
Answer:
a) 254 u of I contains 2 atoms, b) 254 g of I contains 1.2044*10^24 atoms.
Explanation:
Given:Mass of Iodine=127 u.
(a) we know that no. of atoms =Mass given/atomic mass of that element.
=>no. of atoms = 254 u/127 u=2 atoms
(b) we know molar mass of I =127 g.
=>no. of moles =254 g/127 g=2 moles.
Also we know that, no. of atoms= no of moles * Avogadro's no.
=>no. of atoms = 2*6.022 *10^23=12.044 *10^ 23
=1.2044 *10^24 atoms.