Saturday, March 5, 2011

How to calculate the molar mass of aspirin?

First, we need to recall the chemical formula of aspirin
(acetylsalicylic acid): C9 H8 O4


Now, we'll have to
determine the mass of each component atom:


The atomic mass
of C = 12 g


The atomic mass of H = 1
g


The atomic mass of O = 16
g


Now, we  need to multiply each atomic mass by the
specific number of atoms:


C9 = 9*12 = 108 g
(1)


H8 = 8*1 = 8 g (2)


O4 =
4*16 = 64 g (3)


Now, we'll add
(1),(2),(3):


C9 + H8 + O4 = 108 + 8 + 64 = 180
g


The molar mass of aspirin is of 180
g.

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