Question

calculate the number of Gram atoms in gram molecule in 25.4 milligram of I2

Answer 1

1. A gram atom and a gram molecule are termed as a mole of atom and am mole of molecules respectively.
2. For e.g 1 gram atom of oxygen is 1 mole of O and 1 gram molecule of oxygen is 1 mole of O2.
3. In iodine,

       Number of moles of I in 25.4 mg of I = 25.4126.9=0.2

Similarly for I2 = 0.1 m moles.

4. So, 25.4 mg of iodine has 0.2 mmoles of I and 0.1 mmoles of I2.

Answer 2

0.1 molecules are present