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Juli2301 [7.4K]
2 years ago
12

Calculate the number of gold atom

Chemistry
1 answer:
Rasek [7]2 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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8 0
1 year ago
About which of the following can you ask scientific questions
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<h2>Answer:</h2>

Scientific questions are question which are solved involving experiments, observations, or surveys.

Like, Is cancer caused by uncontrolled cell division.

<h3>Explanation:</h3>

Scientific questions are always testable questions. They can be solved by using scientific techniques like PCR, titration etc.

Here the given question in the example can be tested, by making the observations of the cell division of the cancer patients. Then by inducing uncontrolled cell division into normal cells to look for the effect of cell division on cancer.

The questions like, "is sadness can be controlled by talking?" is not a scientific question.

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3 years ago
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