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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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The two boron atoms listed in the table are isotopes of the boron. The two carbon atoms and the two oxygen atoms are also called
Ivan

Answer:

A type of an atom which has a different number of neutrons but the same atomic number, therefore making it the same element. This atom would still have the same properties as well. (Ex: Vanadium-51 is an isotope of Vanadium that has 51 neutrons but still has 23 protons, as its atomic number is 23.)

3 0
2 years ago
A potato chip burned and gave off enough energy to heat up 0.5 kg of water from 20oC to 25o. The specific heat of water is 4,184
Darina [25.2K]

Answer:

Energy produced by the chip =10,460 Joules.

Explanation:

The specific heat of water is one calorie/gram ° C = 4.186 joules/gram ° C, which is higher than any other common substance. As a result, water plays a very important role in regulating temperature. The specific heat per gram for water is much greater than that of a metal, as described in the water-metal example. Replace the mass (m), the temperature change (ΔT), and the specific heat (c) of the solution in the equation Q = c x m x  ΔT, where Q is the heat absorbed by the solution. For specific heat of water we goes as given in the question 4,184 J/kg°C

                          Q =4184×0.5×(25-20)

                              =10,460 Joules.

Thus heat gained by water (Q)= Energy produced by the chip =10,460 Joules.

6 0
3 years ago
Can you look people up on brainly
jasenka [17]
I think yes why?
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What reaction would the chemical equation 2H2O --&gt; 2H2+O2 represent? A) Replacement Of Water B) Combustion of water c) decomp
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Answer;

C. Decomposition of water

Explanation;

A decomposition reaction occurs when one reactant breaks down into two or more products.This can be represented by the general equation: AB → A + B. Examples of decomposition reactions include the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen.

The equation for the decomposition of water; 2H2O --> 2H2+O2


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3 years ago
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Which interaction occurs when light goes into an object as heat energy?
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Interaction occurs when light goes into an object as heat energy is Absorbed light.

Absorbed light makes an object dark. Absorption of light is when the light is absorbed by the object and converts it into heat energy. The objects converts the wavelength of light into the larger wavelength of heat.  this makes the object warmer and produced energy. Absorption depends on the frequency of light that is transmitted. The wavelength of light defined as the distance between the the two successive troughs of the the light wave.

Therefore, Interaction occurs when light goes into an object as heat energy is Absorbed light.

To learn more about Absorbed light here

brainly.com/question/26739493

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8 0
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