What are the different types of JC Chemistry tuition classes available at your centre?

We have 3 modes of learning for students to choose from: weekly physical classes at Bishan; weekly online lessons via Zoom; and on-demand video lessons.

Are you the only Chemistry tutor conducting the classes or do you engage other tutors to do that?

Please be rest assured that I conduct all my classes personally and I do not engage other tutors to teach at my centre.

How well do your students perform after attending your H2 Chemistry tuition classes?

Most of my students showed improvements by at least 3 grades and more than 80% have attained distinction for A Levels. The earlier the students join my classes, the more confident I am in improving their grades.

What is your class size at Bishan?

Usually the class size is around 10 to 12 students. Max class size is 16 pax.

Is there makeup lesson if I miss a class?

Yes makeup lesson is available in the same week subject to availability. If makeup class is not possible, the student can view the recorded video lessons at Google Classroom.

Do you have trial lesson available? How much is it?

Yes we do. Fees for trial lesson are for Bishan class and for Zoom online class.

Does your centre offer O Level chemistry tuition? Do you teach IB / IP chemistry tuition? How about H1 Chemistry?

Chemistry Guru specialises in H2 Chemistry for JC1 and JC2 or IP Year 5 and IP Year 6 students only. Find out all the information about A Level H2 Chemistry and the detailed comparison between H1 and H2 Chemistry. We do not conduct lessons for H1 Chemistry, O Level Chemistry, IB Chemistry or IP Chemistry at IP Year 3 and IP Year 4.

How to Calculate Empirical and Molecular Formula

In this JC1 webinar let's learn how to calculate empirical and molecular formula of ascorbic acid or Vitamin C.

The empirical formula of a compound shows the simplest whole number ratio for the atoms of different elements present in the compound.

The molecular formula of a compound shows the actual number of atoms of the different elements present in the compound.

Let Chemistry Guru, Singapore's renowned JC Chemistry tuition centre, guide you through the question.

calculate empirical and molecular formula question

Given the percentage mass, we can determine the mass of each element in 100g of ascorbic acid and calculate their number of moles.

calculate empirical and molecular formula mass in 100g and moles

We can then divide by the smallest value and round off to the simplest ratio to determine its empirical formula C₃H₄O₃.

calculate empirical and molecular formula det ratio n EF

The molecular formula will be a multiple of the empirical formula, (C₃H₄O₃)_n.

The molar mass is given in the question and we can express the molar mass in terms of n, and hence solve for n.

calculate empirical and molecular formula det MF

Since n = 2, we can then deduce the molecular formula to be C₆H₈O₆.

Topic: Mole Concept, Physical Chemistry, A Level Chemistry, Singapore

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Paper 1

How to Calculate Empirical and Molecular Formula