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UNO [17]
3 years ago
5

Wavelengths are often represented in nm. What is the diameter of a helium (He) atom in

Chemistry
2 answers:
Wittaler [7]3 years ago
8 0

<u>Answer:</u> The diameter of helium atom is 0.1 nm.

<u>Explanation:</u>

We are given:

Diameter of helium atom = 1.0\times 10^{-13}km

To convert this diameter from kilometers to nano meters, we use the conversion factor:

1km=10^{12}nm

Converting the above diameter into nano meters, we get:

\Rightarrow (1.0\times 10^{-13}km)\times (\frac{10^{12}nm}{1km})\\\\\Rightarrow 0.1nm

Hence, the diameter of helium atom is 0.1 nm

lianna [129]3 years ago
5 0

Answer:

Diameter He = 0,1 nm.

Explanation:

Km to nm:

⇒ Diameter He = 1.0 E-13 Km * ( 1000 m / Km ) * (  1 E9 nm / m )

⇒ Diameter He = 0.1 nm

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How many moles are in 25 g KMnO4
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Answer:

0.158 moles KMnO4

Explanation:

According to the Periodic Table,

K = 39.10 g/mol

Mn = 54.94 g/mol

O = 16.00 g/mol

KMnO4 = 39.10 g/mol + 54.94 g/mol + 4(16.00 g/mol) = 158.04 g/mol

25.0 grams KMnO4              1 mole

-----------------------------  x --------------------------  = 0.158 moles KMnO4

                                          158.04 grams

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What statement correctly describes protons?
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A positively charged subatomic particle

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Which element is most likely to gain an electron?
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In which state of H2O will the molecule have the highest kinetic energy? *
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Lanthanum-138 has a half-life of 105 billion years. after 525 billion years, how much of a 240 g sample of this radioisotope wil
Reika [66]

The amount of the 240 g sample of the radioisotope that will remain after 525 billion years is 7.5 g

<h3>How to the number of half-lives that has elapsed</h3>
  • Half-life (t½) = 105 billion years
  • Time (t) = 525 billion years
  • Number of half-lives (n) = ?

n = t / t½

n = 525 / 105

n = 5

<h3>How to determine the amount remaining</h3>
  • Original amount (N₀) = 240 g
  • Number of half-lives (n) = 5
  • Amount remaining (N) = ?

N = N₀ / 2ⁿ

N = 240 / 2⁵

N = 240 / 32

N = 7.5 g

Learn more about half life:

brainly.com/question/26374513

#SPJ4

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2 years ago
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