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A) How many moles of gold atoms are present in a 295-gram sample of gold? B) How many gold atoms would there be in the sample?

Sagot :

5 gram of 197 Au contain 1.53*10^22 atoms. so just multiply that with 59 to get 295 grams :)
thisisbenmanley
The molar mass of gold, Au, as seen on the periodic table, is 196.97 grams per mole. So, do this to find the number of moles in a 295 gram sample:

[tex](295g\ Au)(\frac{1mol\ Au}{196.97g\ Au}) = 1.49769mol\ Au[/tex]

So, a 295 gram sample of gold has about 1.5 moles of gold in it.

To find the number of atoms, multiply the number of moles by Avogadro's number:

[tex](1.49769mol\ Au)(\frac{6.022*10^{23}\ atoms}{mol}) = 9.02 * 10^{23}\ atoms\ Au[/tex]
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