Question

Calculate the number of atoms in each of the following (given :atomic mass of I=127ua.254u of iodine(I) b.254g of iodine(I)

Answer 1

Answer:

As given the atomic mass of I= 127 u

To find the number of atoms we need to divide the atomic mass with the given.

therefore for the 1st answer

the number of atoms will be: 254/127= 2

For the 2nd answer,

No of moles= Mass given/molar mass

254/127 g

= 2 moles

We know 1 mole = 6.02 x 10^24 atoms

2 moles = 2 x 6.02x 10^24 atoms