Transcription of Calculations and Chemical Equations Example: Practice
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Calculations and Chemical Equations Example: Practice
1 Calculations and Chemical EquationsAtomic mass: Mass of an atom of an element, expressed in atomic mass units Atomic mass unit (amu): x 10-24gAtomic weight:Average mass of all isotopes of a given element; listed on the periodic tableExample:Hydrogen atomic weight = amuCarbon atomic weight = amuCarbon atoms are 12 times as massive as hydrogen atomsPractice:Ca atomic mass = amuNe atomic mass = amuHow many Neon atoms are required to give the same mass as one calcium atom?Avogadro s Number: The Mole1 Dozen = 121 Gross = 1441 Mole = x 10231 mole of atoms = x 1023 atoms1 mole of molecules = x 1023 moleculesMolar Mass: the mass (in grams) of one mole a particular substanceThere is a unique relationship between molar mass and atomic weight:Oxygen s atomic weight is amu.
6 Chemical Equations and the Mole Stoichiometry: Study of mass relationships in chemical reactions; ratios of different molecules Example: CH4 + 2O2 ÆCO2 + 2H2O 10 CH4 + 20 O2 Æ10 CO2 + 20 H2O 6.02 x1023 CH 4 + 12.0 x10 23 O 2 Æ6.02 x1023 CO 2 + 12.0 x10 23 H 2O 1 mol CH4 + 2 mol O2Æ1 mol CO2 + 2 mol H2O 16.0g CH4 + 64.0g O2 Æ44.0g CO2 + 36.0gH2O 6.02 x1023 CH 4 + 12.0 x10
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