MOLAR MASS
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Molar Mass: Defining and Calculating the Mass of Elements and Compounds, Study notes of Chemistry
The concept of molar mass, providing definitions and steps to calculate the molar mass of elements and compounds. It includes examples of molar mass calculations for sodium (Na), chlorine (Cl), water (H2O), and aluminum nitrate (Al(NO3)3).
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2021/2022
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MOLAR MASS
DEFINING MOLAR MASS
THE MASS OF 1 MOLE OF ANY SUBSTANCE
THE MASS OF 6.022 X 10^23 PARTICLES
Measured in units of “grams per mole” or g/mol
MOLAR MASS OF COMPOUND
WHAT IS THE MOLAR MASS OF H 2 O?
the FIRST step is the look up the molar mass of individual elements on the periodic table. The SECOND step is to multiple number of elements (subscript) times atomic mass The THIRD step is to add up all elements. molar mass = (atomic mass H)(subscript) + (atomic mass O)(subscript) molar mass = (1.008)(2) + (15.999)(1) = 18.015 g/mol
MOLAR MASS OF COMPOUND (cont).
What is the molar mass of aluminum nitrate, Al(NO 3 ) 3? When the chemical formula contains parenthesis, distribute the subscript to all atoms within parenthesis. Al(NO 3 ) 3 = AlN 3 O 9 Al = 26.982 (1) N = 14.007 (3) O= 15.999 (9) Molar mass Al(NO 3 ) 3 = 26.982 (1) + 14.007 (3) +15.999 (9) = 212.994 g/mol