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Maslowich
2 years ago
10

A single gold atom has a mass of 197.0 amu. How many gold atoms are in a cube of gold that is 10.0 mm on each side (about the si

ze of a sugar cube) if the density of gold is 19.3 g/cm3
Chemistry
1 answer:
lyudmila [28]2 years ago
6 0

Answer:

5.90x10²² atoms of gold are present in the cube

Explanation:

First, we must find the volume of the cube in cm³. With density we can find the mass of the gold and the moles using its molar mass. As 1 mol = 6.022x10²³ atoms we can find the number of atoms:

<em>Volume in cm³:</em>

(10.0mm)³ = 1000mm³

<em>1mm³ = 0.001cm³</em>

1000mm³ * (0.001cm³ / 1mm³) = 1cm³

<em>Mass gold:</em>

1cm³ * (19.3g/cm³) = 19.3g Gold

<em>Moles Gold:</em>

19.3g * (1mol / 197.0g) = 0.0980 moles Gold

<em>Atoms gold:</em>

0.0980 moles Gold * (6.022x10²³ atoms / mol) =

<h3>5.90x10²² atoms of gold are present in the cube</h3>
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6 0
11 months ago
Which stage of the scientific process enables a scientist to check the work of other
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3 0
3 years ago
PLEASE HELP
otez555 [7]

Answer:

P2≈393.609Kpa so I think the answer is 394 kPa

Explanation:

PV=mRT Ideal Gas Law

m and R are constant because they dont change for the problem. That means

PV/T=mR = constant

so P1*V1/T1=P2*V2/T2 and note that the temperatures are in absolute temperatures (Kelvin) because you can't divide by zero.

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5 0
3 years ago
Read 2 more answers
There are 50 fish in the pond that have tags. You catch 25 fish, and 5 of them have tags. What is the best estimate of the numbe
sergeinik [125]

Answer: 250


Explanation:


You work this problem by using proportions.


A proportion is the equalization of two ratios.


Here you assume that the ratio of fish with tags to total fish that you catch is the same than the ratio of fish with tags to total fish in the pond.


Mathematically:

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Solve for x:

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8 0
2 years ago
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Answer:

May be the instrument is incorrect or may be error in it.

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The copper have not been detected by this test because the test may be not for the detection of copper, may be it is used for identification of another minerals. If there is copper in the lake sample but can't be detected in the test so it means that the instrument which is used for detection is not the right one  or having error in that instrument. Every mineral has a specific type of instrument that detect its presence, if we use incorrect instrument for the mineral then we can't detect the presence of that specific mineral.

8 0
2 years ago
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