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Atomic mass Video Lecture | Physics for JEE Main & Advanced
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FAQs on Atomic mass Video Lecture - Physics for JEE Main & Advanced
| 1. What is atomic mass in JEE? |  |
Ans. Atomic mass in JEE refers to the average mass of an atom of an element, taking into account the different isotopes and their relative abundances. It is usually expressed in atomic mass units (amu) or unified atomic mass units (u).
| 2. How is atomic mass calculated? | |
Ans. Atomic mass is calculated by multiplying the mass of each isotope of an element by its relative abundance, and then summing up these values. The formula for calculating atomic mass is:
Atomic mass = (Mass of Isotope 1 × Abundance of Isotope 1) + (Mass of Isotope 2 × Abundance of Isotope 2) + ...
| 3. Why is atomic mass a decimal value? | |
Ans. Atomic mass is a decimal value because it takes into account the presence of different isotopes of an element, each with a different mass. Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses. The decimal value represents the weighted average of the masses of these isotopes.
| 4. How is atomic mass useful in chemistry? | |
Ans. Atomic mass is useful in chemistry as it allows us to determine the molar mass of a substance. The molar mass is the mass of one mole of a substance and is equal to the atomic mass expressed in grams. This helps in various calculations, such as determining the amount of a substance in moles or grams, and in stoichiometry calculations.
| 5. How does atomic mass affect chemical reactions? | |
Ans. Atomic mass affects chemical reactions through the concept of stoichiometry. Stoichiometry is the study of the quantitative relationships between reactants and products in a chemical reaction. The atomic mass is used to determine the mole ratio between different substances involved in a reaction, which is essential for balancing equations and predicting the amount of products formed.
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Dec 18, 2024 Last updated |
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