Mole Concept
Chemistry · मोल संकल्पना · 15 facts
Mole: SI unit of amount; 1 mole = 6.022x10^23 particles (Avogadro number)
Avogadro Number = 6.022x10^23; atoms in 12g Carbon-12
Molar mass = mass of 1 mole in grams = atomic/molecular mass in grams
1 mole water(H2O) = 18g = 6.022x10^23 molecules
1 mole gas at STP(0C,1atm) = 22.4 litres
Moles = mass/molar mass = particles/Avogadro number
Molar mass: O2=32, CO2=44, NaCl=58.5 g/mol
Molecular mass = sum of atomic masses of all atoms in molecule
Empirical formula: simplest ratio; Molecular: actual atoms
Avogadro: equal volumes of gases at same T,P have equal molecules
Molarity (M): moles of solute per litre of solution; unit mol/L
Percentage composition: (mass of element / molar mass) x 100
Stoichiometry: mole ratios from balanced equation predict amounts of products
Equivalent weight: mass that reacts with 1 mole H+ or 8g oxygen
Limiting reagent: reactant that is completely used up first; determines product yield