Grade 9 Exam > Grade 9 Videos > Chemistry for Grade 9 > Molecular Mass and Mole Concept
Molecular Mass and Mole Concept Video Lecture | Chemistry for Grade 9
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FAQs on Molecular Mass and Mole Concept Video Lecture - Chemistry for Grade 9
| 1. What is molecular mass and how is it calculated? |  |
Ans. Molecular mass is the sum of the atomic masses of all the atoms in a molecule. It is calculated by adding up the atomic masses of each individual atom present in the molecule. The atomic masses can be found on the periodic table of elements. For example, the molecular mass of water (H2O) can be calculated by adding the atomic masses of two hydrogen atoms and one oxygen atom: (2 x atomic mass of hydrogen) + (1 x atomic mass of oxygen).
| 2. How is the mole concept used in chemistry? | |
Ans. The mole concept is used in chemistry to measure the amount of a substance. It relates the mass of a substance to the number of particles (atoms, molecules, or ions) it contains. One mole of any substance contains Avogadro's number (6.022 x 10^23) of particles. By using the mole concept, chemists can convert between mass, moles, and number of particles in chemical reactions and calculations.
| 3. Can you explain the difference between molecular mass and molar mass? | |
Ans. Molecular mass refers to the mass of a single molecule, while molar mass refers to the mass of one mole of a substance. Molecular mass is calculated by adding up the atomic masses of the atoms in a molecule, while molar mass is calculated by multiplying the atomic mass of an element by the number of atoms of that element in one mole of the substance. Molar mass is expressed in grams per mole (g/mol) and is used in stoichiometric calculations.
| 4. How do you convert between grams and moles using molar mass? | |
Ans. To convert between grams and moles using molar mass, you can use the following formula:
moles = mass (in grams) / molar mass (in g/mol)
First, determine the molar mass of the substance by summing up the atomic masses of all the atoms present in the molecule. Then, divide the given mass of the substance by the molar mass to calculate the number of moles.
| 5. Why is the mole concept important in chemical calculations? | |
Ans. The mole concept is important in chemical calculations because it allows chemists to determine the amount of a substance involved in a reaction. It provides a way to convert between mass, moles, and number of particles, which is essential for stoichiometric calculations. The mole concept also helps in determining the empirical and molecular formulas of compounds and in balancing chemical equations.
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Oct 25, 2024 Last updated |
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