Mole Concept
Telangana Open School (TOSS) · Class 12 · Chemistry
Flashcards for Mole Concept — Telangana Open School (TOSS) Class 12 Chemistry. Quick Q&A cards covering key concepts, definitions, and formulas.
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Define mole in terms of carbon-12.
Answer
A mole is the amount of substance that contains as many elementary entities (atoms, molecules, etc.) as there are atoms in exactly 12 grams of carbon-12.
What is Avogadro's constant? Give its value.
Answer
Avogadro's constant (Nₐ) is the number of particles in one mole of a substance. Its value is 6.022 × 10²³ mol⁻¹.
How many atoms are in 1 mole of carbon?
Answer
1 mole of carbon contains 6.022 × 10²³ atoms.
What is the molar mass of oxygen gas (O₂)?
Answer
Atomic mass of O = 16 g/mol. O₂ has two oxygen atoms. So, molar mass = 2 × 16 = 32 g/mol.
Calculate the number of moles in 58.5 g of NaCl.
Answer
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol. Using formula: n = mass / molar mass = 58.5 / 58.5 = 1 mol.
How many molecules are in 0.5 mol of water (H₂O)?
Answer
Number of molecules = moles × Avogadro's constant = 0.5 × 6.022 × 10²³ = 3.011 × 10²³ molecules.
What is the mass of 2 moles of CO₂?
Answer
Molar mass of CO₂ = 12 + (2×16) = 44 g/mol. Mass = moles × molar mass = 2 × 44 = 88 g.
Define molar volume of a gas at STP.
Answer
Molar volume is the volume occupied by 1 mole of any gas at standard temperature and pressure (STP: 273 K, 1 bar). It is 22.7 L/mol.
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