Example 1 - Number of Mole and Mass of a Substance

Question
What is the mass of 7.12 mol NaI. [Relative atomic gas: Iodine = 131; Sodium = 23]

Answer:
The relative formula mass of NaI = 23 + 131 = 154.

The mass of 7.12 mol NaI

= Number of mole x Relative Foemula Mass of NaI
= 7.12 x 154
= 1096.48g