how many atoms of gold are in a 5 gram sample of pure gold?

Question

koikkara · Answer

Hai Sweet Friend, @eng0ling  WelcoMe To OpeN studY !!

There are 197 grams per mole for gold, so 5 grams / 197 = .0254 moles There are 6.022 x 10^23 molecules per mole, so  multiply by Avigadro's number, 
.0254 x 6.022 x 10^23 = 1.5284 x 10^22 

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abb0t · Answer

5 grams of Au $\sf \times \frac{mol}{196.96~g~Au}$ = moles of Au. Now use avogadro's number: $\sf \color{red}{6.022 \times 10^{23}\frac{atom}{mol}}$