SK015 Chapter 1.2: Mole Concept

Hello champions.

In this video, example soalan Concentration Measurements yang memerlukan pelajar membuat assumption. My tips, if u need to make an assumption:

  • assume using concentration measurement, don't use density.
  • remember you can only assume ONCE in each question.
Example (KMPK tutorial Q8b)

Phosphoric acid is a weak acid with the chemical formula H3PO4. It is normally encountered as a colourless syrup of 85% concentration in water with the density of 1.88 g/mL at 25 °C. Calculate: 
(a) the molarity of H3PO4. 
(b) the molality of H3PO4. 
(c) the mole fraction of H3PO4.