Ch 1:
Some Basic Concepts
Of
Chemistry
ATOMIC MASS
&
MOLECULAR MASS
???
Why CARBON??
AVERAGE ATOMIC MASS
???
e.g.
PRACTICE QUESTIONS :
• Calculate the relative molecular mass of the following molecules:
i) P4
ii) SO2
iii) HNO3
iv) H2SO4
v) C6H12O6
*
*
*
* Mass of one carbon atom in grams: 1.992648 × 10-23 g
##
Mass of one atom of an element in gram = Mass in amu × 1.661 × 10-24 g