Class 9 Exam > Class 9 Videos > Crash Course: Class 9 (Hinglish) > Mole Concept (Easy Explanation)
Mole Concept (Easy Explanation) Video Lecture | Crash Course: Class 9 (Hinglish)
FAQs on Mole Concept (Easy Explanation) Video Lecture - Crash Course: Class 9 (Hinglish)
| 1. What is the mole concept in chemistry? |  |
Ans. The mole concept is a fundamental principle in chemistry that relates the mass of a substance to the number of particles it contains. It allows chemists to determine the amount of a substance in a given sample by using the Avogadro's number, which states that one mole of any substance contains 6.022 x 10^23 particles.
| 2. How do you calculate the number of moles in a given sample? | |
Ans. To calculate the number of moles in a given sample, you need to divide the mass of the substance by its molar mass. The molar mass is the mass of one mole of the substance and is expressed in grams per mole. This calculation is done using the formula: moles = mass (g) / molar mass (g/mol).
| 3. What is Avogadro's number and how is it related to the mole concept? | |
Ans. Avogadro's number, denoted as 6.022 x 10^23, is the number of particles (atoms, molecules, or ions) present in one mole of any substance. It is a fundamental constant in chemistry and is used to relate the mass of a substance to its number of particles in the mole concept. Avogadro's number allows us to make calculations and conversions between mass and moles.
| 4. How is the mole concept used in stoichiometry? | |
Ans. Stoichiometry is a branch of chemistry that deals with the quantitative relationships between reactants and products in chemical reactions. The mole concept plays a crucial role in stoichiometry as it allows us to determine the ratio of moles between different substances involved in a chemical reaction. This ratio helps in calculating the amount of each substance required or produced in a reaction.
| 5. Why is the mole concept important in chemical calculations? | |
Ans. The mole concept is important in chemical calculations because it provides a way to relate the macroscopic properties of substances (mass, volume, etc.) to their microscopic properties (atoms, molecules, or ions). It allows chemists to quantify and compare the amounts of different substances involved in reactions, helping them to predict and understand the behavior of substances during chemical reactions. The mole concept is also essential for determining the empirical and molecular formulas of compounds.
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