3.3.2. Atomic Mass 1

• Scheikunde
• Middelbare school
• vwo
• Leerjaar 3

There are seven elements which always form molecules with two of their atoms. These are the BrINClHOF substances 

(Br, I, N, Cl, H, O, and F) 

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What is the atomic mass of one nitrogen (N) atom?

What is the total mass of 3 nitrogen molecules

(3N​2​​)

What is the total mass of

5P​2​​O​5​​

What is the combined total mass of
and

CH​4​​

2O​2​​

What is the combined total mass of
and

CO​2​​

2H​2​​O

--> 

CH​4​​(g)+2O​2​​(g)

CO​2​​(g)+2H​2​​O(g)

1 x C = 12,0 u

4 x H = 4 x 1,0 u = 4,0 u

2 x 2 x O = 4 x 16,0 u = 64,0 u

12+4+64= 80 u total

1 x C = 12,0 u

2 x O = 2 x 16,0 u = 32,0 u

2 x 2 x H = 4 x 1,0 u = 4,0 u

2 x O = 2 x 16,0 u = 32,0 u

12+32+4+32 = 80 u total

   16,0 u    :    64,0 u      :        44,0 u    :    36,0 u