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Ncert chemistry class 9 mole concept numericals || atoms and molecules numericals Video Lecture
FAQs on Ncert chemistry class 9 mole concept numericals -- atoms and molecules numericals Video Lecture
| 1. How do you calculate the number of atoms or molecules in a given amount of substance? |  |
Ans. To calculate the number of atoms or molecules in a given amount of substance, you need to use Avogadro's number. Avogadro's number is 6.022 x 10^23, which represents the number of atoms, ions, or molecules in one mole of a substance. To calculate the number of atoms or molecules, you multiply the given amount of substance by Avogadro's number.
| 2. What is the difference between atoms and molecules? | |
Ans. Atoms are the basic building blocks of matter and are the smallest unit of an element that retains its chemical properties. On the other hand, molecules are formed when two or more atoms chemically combine. Molecules can be made up of atoms of the same element (diatomic molecules) or different elements (compound molecules). In summary, atoms are singular units, while molecules are made up of multiple atoms.
| 3. How is the concept of mole used in chemistry? | |
Ans. The concept of a mole is used in chemistry to quantify the amount of a substance. It is similar to how we use terms like dozen or gross to represent a specific number of items. One mole of any substance contains Avogadro's number of atoms, ions, or molecules (6.022 x 10^23). The mole allows scientists to measure and compare the amounts of different substances on a macroscopic scale.
| 4. How can I convert moles to grams and vice versa? | |
Ans. To convert moles to grams, you need to use the molar mass of the substance. The molar mass is the mass of one mole of a substance and is expressed in grams/mole. To convert moles to grams, you multiply the number of moles by the molar mass.
To convert grams to moles, you divide the mass of the substance by its molar mass. This will give you the number of moles present in the given mass.
| 5. What is the significance of the mole concept in stoichiometry? | |
Ans. The mole concept is essential in stoichiometry, which is the study of the quantitative relationships between reactants and products in a chemical reaction. By using the mole concept, stoichiometry allows us to determine the balanced chemical equation, calculate the amount of reactants needed, and predict the amount of product formed. It helps us understand the ratios of different substances involved in a reaction and enables precise calculations in chemical reactions.
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Nov 25, 2024 Last updated |
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