Participation will improve your understanding in Chemistry. You should not worry if you are right or wrong at this moment. This is your learning window period. If your answer or working is wrong, let us (all the readers) to suggest our answer, so that we can all learn together.
Do leave your answers and working in the “Comment” section directly below this post.
Example:
The following results were obtained in an experiment to determine the formula of an oxide of silicon.
Mass of crucible (empty) = 15.20g
Mass of crucible + silicon = 15.48g
Mass of crucible + oxide of silicon = 15.80g
a) Find the empirical formula of the oxide of silicon
b) If the Mr of the oxide of silicon is 60, what is its molecular formula?
PS: “Either You Practice & Use It, or You Loose It!”
PSS: Check “Comments” below for Suggested Answers.
Related Articles:
- O Level Chemistry: Determining Molecular Formula from Empirical Formula
- O Level Chemistry: Mole Concepts / Chemical Calculations
- O Level Chemistry: Mole Concepts / Chemical Calculations
- O Level Chemistry: Molecular & Empirical Formulae
- O Level Chemistry: Common Errors in Calculating Empirical Formula
Mass of silicon
= 15.48-15.20
=0.28g
Mass of silicon oxide
=15.80-15.20
=0.60g
Mass of oxygen
=0.60-0.28
=0.32g
Element Si O
Mass of Element 0.28g 0.32g
Ar of Element 28 16
No. of moles 0.01mol 0.02mol
Molar ratio 1 : 2
a) Hence, empirical formula of silicon oxide: SiO2
n= 60/ (28+32)
n=1
b) thus, molecular formula = SiO2
Reply
Well Presented Answer. That is Awesome!
Keep up the good work.
Reply