How to calculate the molar mass of aspirin?

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atyourservice's profile pic

atyourservice | Student, Grade 11 | (Level 3) Valedictorian

Posted on

the chemical formula for aspirin is C9H8O4

the molar mass of an element is it's atomic mass rounded to the nearest whole number, so:

c- 12

h- 1

o - 16

now multiply these number by how many of each there are in the formula:

c - 12 x 9 = 108

h - 1 x 8 = 8

0 - 16 x 4 = 64

add these numbers up

108 + 8 + 64 = 180

so 180g

giorgiana1976's profile pic

giorgiana1976 | College Teacher | (Level 3) Valedictorian

Posted on

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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