Question: In Chem, I'm having trouble in Mole calculations what should I do to improve?

Arnold Lambisia answered on 8 Jul 2025:

I had similar problems like you – Mole calculations were not easy.

An approach I used was to understand the basics of calculating moles from mass or vice cersa, in solutions and particles. Formulas may be challenging to master but if you can write them down correctly you may be half way there to solving the calculations. So understand the question asked, write down the formula to get the relationships then calculate the answer.

For example: How many moles are in 0.05 g Hg?

Formula: moles (n) = mass (m) / molar mass (M)
Relationship is 1 mol Hg = 200.59 g Hg
so if 1 mol Hg = 200.59 g Hg
?? = 0.05 g Hg

Then you calculate your answer by dividing 0.05 with 200.59 g Hg and you get 0.0002492647 mol Hg.

Hope this helps.