Chemical Arithmetics — Chapter Summary
Telangana Open School (TOSS) · Class 12 · Chemistry
Summary of Chemical Arithmetics for Telangana Open School (TOSS) Class 12 Chemistry. Part of the Telangana Open School (TOSS) Class 12 Chemistry syllabus.
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Overview
In chemistry, we often need to measure and calculate the amounts of substances involved in reactions. Since atoms and molecules are extremely small and cannot be counted or weighed individually, we use a special unit called the 'mole' to handle them in practical quantities. This chapter, Chemical Ar
Key Concepts
The empirical formula shows the simplest
The empirical formula shows the simplest whole-number ratio of atoms in a compound, while the molecular formula gives the actual number of atoms of ea
It is the percentage by mass
It is the percentage by mass of each element in a compound. It is calculated by dividing the total mass of an element in one mole of the compound by t
The mole concept connects the microscopic
The mole concept connects the microscopic world of atoms and molecules to measurable quantities. One mole contains Avogadro's number (6.022 × 10²³) of
The limiting reagent is the reactant
The limiting reagent is the reactant that is completely consumed in a chemical reaction and thus determines the maximum amount of product that can be
Learning Objectives
- Define empirical and molecular formulae
- Differentiate between empirical and molecular formulae
- Calculate percentage by mass of an element in a compound and determine empirical formula from percentage composition
- Establish relationship between mole, mass, and volume
- Calculate the amount of substances consumed or formed in a chemical reaction using a balanced equation and mole concept
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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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