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Juli2301 [7.4K]
3 years ago
12

Calculate the number of gold atom

Chemistry
1 answer:
Rasek [7]3 years ago
8 0

The number of gold atom : 1.204 x 10²¹

<h3>Further explanation</h3>

Given

0.6 g of 18 carat gold

mass number of gold = 197

24 carat as 100% gold

Required

The number of gold atom

Solution

Percentage of gold in 18 carat :

\tt \dfrac{18}{24}\times 100\%=75\%

Mass of gold in 0.6 g of 18 carat :

\tt 75\%\times 0.6~g=0.45~g

mol :

\tt mol=\dfrac{mass}{MW}=\dfrac{0.45}{197}=0.0023

A mole is a number of particles(atoms, molecules, ions)  in a substance

1 mole = 6.02.10²³ particles  

So the number of gold atom :

\tt 0.0023\times 6.02\times 10^{23}=1.204\times 10^{21}

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