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3.3.2. Atomic Mass 1

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This lesson contains 10 slides, with interactive quizzes and text slides.

Lesson duration is: 30 min

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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

(3 N^{​ 2 ​ ​})

What is the total mass of

5 P^{​ 2 ​ ​} O^{​ 5 ​ ​}

What is the combined total mass of
and

C H^{​ 4 ​ ​}

2 O^{​ 2 ​ ​}

What is the combined total mass of
and

C O^{​ 2 ​ ​}

2 H^{​ 2 ​ ​} O

-->

C H^{​ 4 ​ ​} (g) + 2 O^{​ 2 ​ ​} (g)

C O^{​ 2 ​ ​} (g) + 2 H^{​ 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