The following Mole Calculation question is not difficult but many O Levels Chemistry students tends to make mistake in exams, where time is not a luxury. When the same question was posed to my regular classes of Sec 3 and 4 O Levels and IP students, i realised that many fall into the trap also.
Let’s take a look at the question.
Question:
The relative atomic mass of chlorine is 35.5. What is the mass of 2 mol of chlorine gas?
A. 142g
B. 71g
C. 35.5g
D. 2g
Before we continue, let’s do a quick recap on the formula we need to use to solve this question, which is:
Mass = Mole x Mr of Molecule
Try it first on your own! Once you have an answer, find out the Correct Answer, Common Mistakes made by Students as well as my Suggested Solution below.
Enjoy!
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