Available Answers

1. 1.

   The mass or an atom of oxygen is 16.0 u. Express it in kg.

2. 2.

   The mass or a molecule or hydrogen is 3.332 x 10^-27 kg. Find the mass or 1 kg mol of hydrogen gas.

3. 3.

   The size of a particle is 4.6 μ. Express it in metre.

4. 4.

   It takes 5 years for light to reach the earth from a star. Express the distance of star from the earth in (i) light year. (ii) km. Take speed of light = 3 x 10⁸ m s^-1 and 1 year = 3.1 x 10⁷ s.

5. 5.

   The average mass of an atom of uranium is 3.9 x 10^-25 kg. Find the number of atoms in 1 g or uranium .

6. 6.

   What is meant by measurement?