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Formula Sheet

Chemical Arithmetics — Formula Sheet

Telangana Open School (TOSS) · Class 12 · Chemistry

8 formulas from Chemical Arithmetics (Telangana Open School (TOSS) Class 12 Chemistry) on one page, grouped by topic.

53 questions30 flashcards8 formulas & key relations4 concepts

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8 Entries · 6 Sections

Formulas and Key Relations

Molecular and Empirical Formulae

Molecular Formula = (Empirical Formula) × n

Percentage Composition

% mass of element = (mass of element in 1 mol compound / molar mass of compound) × 100

Determination of Empirical Formula

Step 1: % → Mass in 100g → Moles → Divide by smallest → Multiply to whole numbers

Reaction Stoichiometry

Mole Ratio = Coefficients from Balanced Equation

Mass = Moles × Molar Mass

Volume of gas at STP = Moles × 22.7 L/mol

Molecular formula = n × Empirical formula, where n is an integer.

Percentage composition = (Mass of element in 1 mol / Molar mass) × 100

Full sheet with units and worked examples

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Frequently Asked Questions

What are the important topics in Chemical Arithmetics for Telangana Open School (TOSS) Class 12 Chemistry?
Key topics in Chemical Arithmetics include Molecular and Empirical Formulae, Percentage Composition and Empirical Formula, Stoichiometry and Chemical Equations, Limiting Reagent and Reaction Yield. Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How many formulas are in Chemical Arithmetics?
This sheet lists 8 formulas from Chemical Arithmetics, grouped by topic. Learn what each symbol stands for so you can apply the formula, not just recall it.
How should I revise Chemical Arithmetics for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 53 practice questions on Chemical Arithmetics. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Chemical Arithmetics

All Telangana Open School (TOSS) Class 12 Chemistry Formula Sheet

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