Atoms and Molecules-Sample Questions

1.  Explain the molecular mass of C₂H₅OH.

2.  Explain the law of constant proportion.

3.  Explain the difference of O₂ and 2O.

4.  Find the number of moles in 7g of Na.

5.  What is the atomicity of Ca(OH)₂?

6.  Write the formula for Aluminium Chloride.

7.  State the difference between sodium atom and sodium ion.

8.  What is formula unit mass? How is it different from molecular mass?

9.  Define valency and give valency of copper and iron.

10.  Calculate the mass of one molecule of chlorine.