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Viefleur [7K]
4 years ago
8

How many moles of silver atoms are in 1.8 x 10^-21 atoms of silver?

Chemistry
1 answer:
rodikova [14]4 years ago
6 0
Hola!

We know,
1 Mole of anything has 6.02 × 10^{-23} particles

According to Question,

6.02 × 10^{-23} = 1 Mole

Thus,

1.8 × 10^{-21} / 6.02 × 10^{-23} = 0.33 Moles

hope it helps!
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What happens to cabbage indicator when in clear soda. Why?
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Answer:

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Explanation:

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2 years ago
Calculate the linear momentum of photons of wavelength<br> (a) 600 nm,<br> (b) 70 pm,<br> (c) 200 m.
lubasha [3.4K]

Answer:

a) p = 1.10 * 10⁻²⁷ kg·m/s

b) p = 9.46 * 10⁻²⁴ kg·m/s

c) p = 3.31 * 10⁻³⁶ kg·m/s

Explanation:

To solve this problem we use the <em>de Broglie's equation, </em>which describes the wavelenght of a photon with its momentum:

λ=h/p

Where λ is the wavelength, h is Planck's constant (6.626 * 10⁻³⁴ J·s), and p is the linear momentum of the photon.

Rearrange the equation in order to solve for p:

p=h/λ

And now we proceed to calculate, <u>keeping in mind the SI units</u>:

a) 600 nm= 600 * 10⁻⁹ m

p=(6.626 * 10⁻³⁴ J·s) / (600*10⁻⁹m) = 1.10 * 10⁻²⁷ kg·m/s

b) 70 pm= 70 * 10⁻¹² m

p=(6.626 * 10⁻³⁴ J·s) / (70*10⁻¹²m) = 9.46 * 10⁻²⁴ kg·m/s

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3 years ago
A crystallographer measures the horizontal spacing between molecules in a crystal. The spacing is 15.93nm. What is the total wid
salantis [7]

0.00167265 mm

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so 15.93 nm = 15.93 * 10^{-9} = 1.593 * 10^{-8} m

Spacing between 2 molecules is  1.593 * 10^{-8} m

So total width of 105 molecules crystal is 1.593 * 10^{-8} *105 = 167.265 * 10^{-8} m

We know that

1 m = 1000 = 10^{3} mm

So total width of 105 molecules crystal in millimeters is 167.265 * 10^{-8}  *10^{3}

 = 167.265 * 10^{-5} = 1.67265 * 10^{-3} mm = 0.00167265 mm

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