The Mole & the Avogadro Constant:-
The mole, symbol mol, is the SI unit of the amount of substance
One mole of a substance contains the same number of the stated particles
This can be atoms, molecules or ions
One mole contains 6.02 x 1023 particles; this number is known as the Avogadro Constant
The mass of 1 mole of a substance is known as the molar mass
For an element, it is the same as the relative atomic mass written in grams
For a compound, it is the same as the relative molecular or formula mass in grams
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How many moles are in 100 grams of glucose (C₆H₁₂O₆)?(Molar mass of C₆H₁₂O₆ = 180 g/mol)
Determine the number of atoms in 3 moles of helium (He).(Use Avogadro’s number: (6.022 \times 10^{23}) atoms/mol)
What is the mass of 5 moles of sulfuric acid (H₂SO₄)?(Molar mass of H₂SO₄ = 98 g/mol)
How many moles are in 25 grams of ammonia (NH₃)?(Molar mass of NH₃ = 17 g/mol)
Calculate the number of moles in 0.5 grams of hydrogen gas (H₂).(Molar mass of H₂ = 2 g/mol)
What is the mass of 1.5 moles of calcium carbonate (CaCO₃)?(Molar mass of CaCO₃ = 100 g/mol)
How many molecules are in 0.25 moles of methane (CH₄)?(Use Avogadro’s number: (6.022 \times 10^{23}) molecules/mol)
What is the mass of 0.75 moles of sodium chloride (NaCl)?(Molar mass of NaCl = 58.44 g/mol)