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3 years ago

How many gold atoms are in a 1kg gold bar?

Physics

2 answers:

Naya [18.7K]3 years ago

7 0

Answer:

The answer is a 1 kilo gold bar has 32.15 ounces of gold or 1000 grams.

Explanation:

SpyIntel [72]3 years ago

3 0

Answer:

. You use the fact that 1 mole of any substance contains exactly 6.022⋅1023 atoms or molecules of that substance - this is known as Avogadro's number. In your case, 1 mole of gold will have exactly 6.022⋅1023 atoms of gold

Explanation:

Well, what is the molar mass of gold metal?

My (and your!) Periodic Table tells me that it has a molar mass of 196.97∙g∙mol−1.

And so (i) we determine the molar quantity of gold, i.e.

Moles of gold≡1000∙g196.97∙g∙mol−1≡5.077∙mol.

And (ii), since we KNOW that 1∙mol represents 6.02214076×1023 individual items…we take the product….

5.077∙mol×6.02214076×1023∙mol−1≡3.057×1024∙individual gold atoms.

Given that gold is worth $48–30 USD∙g−1 how much is this mass worth? And what is the price for an ATOM of gold?

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Atoms with many electron shells will let go of their electrons more easily than those with fewer shells.

Anna007 [38]

True

The more the number of shells will let go of their outer electrons more easily because the effective nuclear charge on the outer (valence) electrons will be lower. This is called 'shielding', the outer electrons will be shielded from the nucleus by the inner electrons.

Hope this Helps

8 0

3 years ago

Read 2 more answers

The intensity of a 70-dB whistle is quintupled. What is the new decibel level

hoa [83]

Multiplying the power of any signal by 5 can be described as
an increase of 6.99 dB .

If the whistle blew at 70 dB initially, and its sound power became
multiplied by 5, and the whistle and the listener both stayed in
the same places, then the listener would tell you that the whistle
was now blowing at 76.99 dB .

(More likely, he would report "77 dB" as he held his ears and winced.)

7 0

3 years ago

Benzene is a starting material in the synthesis of nylon fibers and polystyrene (styrofoam). Its specific heat capacity is 1.74

sweet-ann [11.9K]

Answer: $62.7^0C$

Explanation:

The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

$Q=m\times c\times \Delta T$

Q = Heat absorbed= 16.7 kJ = 16700 J (1kJ=1000J)

m= mass of benzene = 225 g

c = specific heat capacity = 1.74 J/gK

Initial temperature of the water = $T_i$ = 20.0°C = 293 k $0^0C=273K$

Final temperature of the water = $T_f$ = ?

Change in temperature , $\Delta T=T_f-T_i$

Putting in the values, we get:

$16700=225\times 1.74\times (T_f-293)$

$T_f=335.6K=62.7^0C$

The final temperature will be $62.7^0C$

8 0

3 years ago

BaLLatris [955]

Answer:

The conduction path or simply the wires connected between different components in a circuit.

Explanation:

The wire makes up the path for the electricity to flow and most of the electricity flows through this. It is like a road connecting two house or buildings in a town and the traffic of vehicles is the electricity (current).

5 0

3 years ago

A car driving at a constant speed of 64 mi/h travels 68 miles. How many hours did this take?

babymother [125]

64 miles/hour
Therefore 1/64 hours/mile
68 miles * 1/64 hours/mile (notice how miles cancels out)
Therefore the answer is 68/64 hours = 1.0625 hours = 1 hour 3min and 45sec.

3 0

3 years ago