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Molecular mass and molecular weight Video Lecture - Class 9

FAQs on Molecular mass and molecular weight Video Lecture - Class 9

1. What is molecular mass and molecular weight?

Ans. Molecular mass and molecular weight refer to the mass of a molecule. Molecular mass is the sum of the atomic masses of all the atoms in a molecule, whereas molecular weight is the average mass of a molecule compared to the mass of a carbon-12 atom.

2. How is molecular mass calculated?

Ans. To calculate the molecular mass of a molecule, we need to find the atomic masses of all the atoms in the molecule and add them together. The atomic masses can be found on the periodic table. For example, for water (H2O), the molecular mass would be calculated as 2(atomic mass of hydrogen) + atomic mass of oxygen.

3. What is 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. Molar mass is calculated by multiplying the molecular mass by the Avogadro's number (6.022 x 10^23).

4. How is molecular weight determined experimentally?

Ans. Molecular weight can be determined experimentally using various techniques such as mass spectrometry. Mass spectrometry measures the mass-to-charge ratio of ions and provides information about the molecular weight of a compound.

5. Why is molecular mass important in chemistry?

Ans. Molecular mass is important in chemistry as it helps in determining the stoichiometry of chemical reactions, calculating the percent composition of compounds, and determining the molecular formula of a substance. It is also crucial in understanding the physical and chemical properties of substances.

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