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MoLE ConCepT in 40 mins : CBSE / ICSE : CHEMISTRY : Class 10, Class 11, Class 12

Physics Wallah - Alakh Pandey・33 minutes read

The mole concept in chemistry involves understanding Avogadro's number, calculating molar mass, and determining the number of moles using specific formulas and atomic masses. The molar volume of an ideal gas at STP is 22.4 liters, and formulas for calculating moles include Volume given / Molar volume and Number of moles = Mass given / Molar mass.

Insights

  • A mole is a number equal to 6.022 * 10^23 known as Avogadro's number, represented by capital L and A, used to calculate masses in chemistry.
  • Molar mass, calculated by multiplying atomic mass by Avogadro's number, is crucial in determining the number of moles of a substance, aiding in various calculations such as finding molecular mass and molar volume in chemistry.

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Recent questions

  • What is the concept of a mole in chemistry?

    A mole is a number equivalent to 6.022 * 10^23.

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Summary

00:00

Understanding Mole Concept in Chemistry

  • Mole concept involves understanding the concept of a mole, which is a number equivalent to 6.022 * 10^23.
  • A mole is also known as Avogadro's number, symbolized as capital L and A.
  • In chemistry, starting with a single atom of carbon, which contains six protons, neutrons, and electrons, the mass is calculated.
  • The mass of an atom of carbon is 12 atomic mass units (ay).
  • Molar mass, or gram atomic mass, is calculated by multiplying the atomic mass by Avogadro's number.
  • The molar mass of carbon is 12 grams.
  • The number of moles is calculated by dividing the given mass by the gram atomic mass.
  • The formula for calculating the number of moles is mass given divided by gram atomic mass.
  • The number of moles of different elements like nitrogen, sulfur, and hydrogen is determined using their atomic masses.
  • Molecular mass is calculated by considering the mass of a molecule in atomic mass units and multiplying it by Avogadro's number.

13:17

Calculating Molar Mass and Moles Simplified

  • Molar mass is the mass of one mole, also known as gram atomic weight or gram molecular mass.
  • To calculate molar mass, add the atomic masses of the elements involved.
  • Examples given include finding the molar mass of nitrogen, sulfur, oxygen, hydrogen, phosphorus, and other molecules.
  • The formula for calculating moles is mass given divided by molar mass.
  • The number of moles is equal to the given mass divided by the molar mass.
  • The number of atoms in a mole is 6.022 * 10^23 atoms.
  • The formula for mass given divided by molar mass is crucial in determining the number of moles.
  • The molar mass of a substance can be calculated by adding the masses of the atoms involved.
  • The molar volume of an ideal gas at STP is 22.4 liters.
  • To find the volume occupied by a certain number of moles of a gas, multiply the molar volume by the number of moles.

26:58

Moles, Molar Mass, and Volume Calculations

  • One mole measures 22.4 liters, while three moles measure 3 * 22.4 liters.
  • Formulas for moles include Moles = Volume given / Molar volume and Number of moles = Mass given / Molar mass.
  • Molar mass is calculated by finding atomic mass and converting it to grams.
  • To find the number of moles of a substance, apply the formula Volume given / Molar volume.
  • Calculate the number of moles of ozone gas in 5.6 decimeters at STP using the formula.
  • Determine the number of hydrogen atoms in 11.2 liters of hydrogen gas by finding the moles first.
  • In one mole of hydrogen, there are 6.022 * 10^23 atoms of hydrogen.
  • To find the volume of 8 grams of oxygen gas, calculate the number of moles using the given mass and molar mass.
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