Chemistry formulas for Atoms, Molecules and Chemical Arithmetic Part II | Chemistry Notes Info - Your Chemistry Tutor provide notes for Classes, BSc, MSc, Chemistry Test

Chemistry formulas for Atoms, Molecules and Chemical Arithmetic Part II

Chemistry formulas for Atoms, Molecules and Chemical Arithmetic Part II

Gram Atomic Weight (GAW) related Chemical Formulas

·         No. of Gram Atoms or Mole Atoms = Weight of an Element/GAW
·         Weight of an Element in gram = No. of Gram Atoms x GAW
·         No. of atoms in 1 GAW = 6.02x1023
·         No. of atoms in given substance = 6.02x1023 x Weight/GAW
·         No. of atoms in 1 gram of an element = 6.02x1023/Atomic Weight

Gram Molecular Weight (GMW) related Chemical Formulas

·         No. of Gram molecules or Mole Molecules = Weight of Substance/GMW
·         Weight of Substance in gram = No. of Gram Molecules x GMW
·         Avogadro’s No. = 6.02x1023 per mol

Mole Concept related Chemical Formulas

·         1 mole contains 6.02x1023 particles
·         1 mole of an atom = 1 GAW of it
·         1 mole of a compound = 1 GMW of it
·         Examples, 1 mole of Na = 23 g
·         1 mole of H2O = 18 g
·         1 mole of OH- ions = 17 g
·         1 mole = 1 gram molecules
·         1 mole = 1 gram molecular weight
·         1 mole = 22.4 litres at NTP
·         1 mole = 6.02x1023 molecules
·         1 mole = 1 gram atomic weight
·         1 mole = 6.02x1023 atoms
·         No. of Moles = Weight of Substance in Gram/Gram Molecular Weight
·         No. of Moles = No. of Unitary Particles/Avogadro’s No.
·         No. of Moles = Volume in Litres at NTP/22.4 Litres

Gram Molecular Volume related Chemical Formulas

·         1 Gram Molar Volume = 22.4 Litres
·         Example, Volume of 16 gram (1 mole) of CH4 at STP= 22.4 Litres
·         Volume of 2 gram (1 mole) of H2 at STP = 22.4 Litres
·         Weight of 11.2 litres of any Gas at STP = VD (Vapour Density) of that Gas in Gram
·         Density of Gas at NTP = Molar Weight in Gram/22400 mL

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