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Molar Mass •By definition, a molar mass is the mass of 1 mol of a substance (i.e., g/mol). –The molar mass of an element is the mass number for the element that we find on the periodic table. –The formula weight (in amu’s) will be the same number as the molar mass (in g/mol).
Short Notes: Form 4 Chemistry Chemical Formulae and Equation Calculation . Summary Summary . ÷ molar volume . × molar volume : × molar mass . Avogadro Constant . Number of particles . Mole of particles . Mass of particle (in gram) ÷ molar mass ; × Avogadro Constant . Volume of Gas ; For Solid, liquid or gas ;
relative formula mass of desired product relative formula mass of all reactants (sum of) Energy (waves) ∆E = h ν ∆E = change in energy (J) h = planks constant (6.62 x 10-34 J s-1) c = ν λ c = speed of light (3 x 108 m s-1) ν = frequency (Hz, s-1) λ = wavelength, m V i C i = V f C f Relative Atomic Mass A r E cell
Molar mass is defined as the amount of mass of a chemical substance when formula mass is taken grams. For Example, molar mass of C 6H 12O 6 is 180.18 g since Formula mass of C 6H 12O 6 is 180.18 g/mole. Molar mass contains mole (6.022 x 10 23) of formula (C 6H 12O 6) units. The atomic mass of sodium is 23.0 amu and molar mass is 23.0 g/mol
The Mole Review 1) Define “mole”. 2) How many moles are present in 34 grams of Cu(OH) 2? 3) How many moles are present in 2.45 x 1023 molecules of CH 4? 4) How many grams are there in 3.4 x 1024 molecules of NH 3? 5) How much does 4.2 moles of Ca(NO 3) 2 weigh? 6) What is the molar mass of MgO?
A similar relationship holds for compounds: the molecular mass (or formula mass) of a compound expressed in amu is numerically the same as the mass of 1 mole of the compound expressed in grams.
3.4 The molecular mass is the sum of the atomic masses of the atoms or ions in a molecule. The molar mass is the mass of 1 mole of a chemical entity. Both will have the same numeric value for a given chemical substance but molecular mass will have the units of amu and molar mass will have the units of g/mol.