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he molar mass of gold is 0.197kg. Calculate the mass of a gold atom, to 3 SF. (1 mole = 6x10e23)

Guest Mar 3, 2015

Best Answer 

 #4
avatar+94105 
+5

Thanks Alan.   

Melody  Mar 4, 2015
 #1
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+5

Just divide the mass by Avogadro's number (given in the question as 6*1023)

$$\frac{0.197}{6\times 10^{23}}= 0.03283\times 10^{-23}kg$$

or 

$$3.28\times 10^{-25}kg$$

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Alan  Mar 3, 2015
 #2
avatar+94105 
0

Thanks Alan,

So is there always  6x10^23 atoms in a mole (of anything) ?

Can you (or someone else) tell us a little about the significance of Avogadro's number? (Only if  is relatively easy to do.  )

Melody  Mar 4, 2015
 #3
avatar+27228 
+5

By definition a mole is Avogadro's number worth!  

 

Avogadro's number is more precisely given by: 6.02214129×1023 

 

Have a look at http://en.wikipedia.org/wiki/Avogadro_constant for more details.

.

Alan  Mar 4, 2015
 #4
avatar+94105 
+5
Best Answer

Thanks Alan.   

Melody  Mar 4, 2015

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