Question

Calculate the molar mass of acetone?

Answer 1

1. Molar mass is the sum of the masses of all the individual atoms present in a molecule.
2. The chemical formula of acetone is ${\mathrm{CH}}_3{\mathrm{COCH}}_3$
3. The atomic mass of carbon C is 12u.
4. The atomic mass of hydrogen H is 1u.
5. The atomic mass of oxygen O is 16u
6. $\mathrm{Molar}\mathrm{mass}\mathrm{of}{\mathrm{CH}}_3{\mathrm{COCH}}_3\mathrm{acetone}=\mathrm{Mass}\mathrm{of}3\mathrm{carbon}\mathrm{atoms}+\mathrm{Mass}\mathrm{of}6\mathrm{hydrogen}\mathrm{atoms}+\mathrm{Mass}\mathrm{of}1\mathrm{oxygen}\mathrm{atom}.$

$=(3\mathrm{x}12)+(1\mathrm{x}6)+(16\mathrm{x}1)$

$=36+6+16$

= 58 g

Molar mass of CH₃COCH₃ acetone is 58 g.