- #1

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- Thread starter batballbat
- Start date

- #1

- 127

- 0

- #2

Borek

Mentor

- 28,655

- 3,148

N_a X 1 u = 1

Or was the carbon 12 taken exactly to make this valid?

In a way you listed the same reason twice. Note what happens when you list units:

[tex]N_a[\frac{atom}{mole}] \times u[\frac{g}{atom}] = 1[\frac{g}{mole}][/tex]

- #3

morrobay

Gold Member

- 767

- 233

1 atomic mass unit = 1.6605655 x 10

Once it is determined that 1 gram Hydrogen contains :

1 g. H / 1.6605655 x 10

1 mole H = Avogadro's number. Then it follows for 1 mole of any other element.

Take 40 grams of Zr :

40 g. Zr/ 40 * 1.660565 x 10

40 g. Zr / 6.642 x 10

- #4

morrobay

Gold Member

- 767

- 233

1 atomic mass unit = 1.6605655 x 10^{-24}grams

Once it is determined that 1 gram Hydrogen contains :

1 g. H / 1.6605655 x 10^{-24}g = 6.02 x 10^{23}

1 mole H = Avogadro's number. Then it follows for 1 mole of any other element.

Take 40 grams of Zr :

40 g. Zr/ 40 * 1.660565 x 10^{-24}g. =

40 g. Zr / 6.642 x 10^{-23}g = 6.02 x 10^{23}

This should be 91 grams Zr :

so : 91 grams Zr / 91 * 1.66 x 10 ^ -24 g

= 91 g Zr / 15.1 x 10^-23 g = 6.02 x 10^23

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