# Write Answer to the Following Question and Explain Your Answer. Explain with Examples What is Meant by a 'Mole' of a Substance . - Science and Technology

Short Note

Explain with examples what is meant by a 'mole' of a substance .

#### Solution

One mole is defined as the amount of substance containing as many elementary entities (atoms, molecules, ions, electrons, radicals, etc.) as there are atoms in 12 grams of carbon-12 (6.023 x 1023).
The mass of one mole of a substance equals to its relative molecular mass expressed in grams. Mole defines the quantity of a substance. One mole of any substance will always contain 6.022 × 1023 particles, no matter what that substance is. Therefore, we can say:

• 1 mole of potassium atoms (K) contains 6.022 × 1023 potassium atoms.
• 1 mole of potassium ions (K+) contains 6.022 × 1023  potassium ions.
• 1 mole of hydrogen atoms (H) contains 6.022 × 1023 hydrogen atoms.
• 1 mole of hydrogen molecules (H2) contains 6.022 × 1023 hydrogen molecules.
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#### APPEARS IN

Balbharati Science and Technology 9th Standard Maharashtra State Board
Chapter 4 Measurement of Matter
Exercise | Q 4.5 | Page 57