Q1
What is Avogadro's number?
A6.022×10²³
B6.022×10¹⁰
C3.14×10²³
D1×10²³
SSCClass 9 (SSC)Science and Technology (विज्ञान आणि तंत्रज्ञान)Ch 4 · Topic 2
Practice and Revision - Measurement of Matter
Let us practise and revise what we learned about measurement of matter. Measuring matter involves the mole concept, molar mass, and related
Core concept
The mole is a unit representing 6.022×10²³ particles (Avogadro's number), whether atoms, molecules, or ions of a substance.
How it works
Molar mass is the mass of one mole of a substance in grams, numerically equal to its atomic or molecular mass.
Why it matters
The number of moles can be calculated by dividing the given mass by the molar mass (n=mass/molar mass).
Key detail
Understanding mole concept and related calculations is essential for balancing chemical equations and stoichiometric calculations.
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Quick notes
• Mole: 6.022×10²³ particles (Avogadro's number).
• Molar mass: mass of 1 mole in grams.
• Equals atomic/molecular mass numerically.
• Moles = mass ÷ molar mass.
• This calculates the number of moles.
• Essential for balancing chemical equations.
• Also for stoichiometric calculations.
• Practice builds calculation skills.