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alina1380 [7]
2 years ago
13

Which sample contains the fewest atoms? a. 10 g of c b. 10 g of ne c. 10 g of f d. 10 g of n e. 10 g of o

Chemistry
1 answer:
Lerok [7]2 years ago
7 0

The molar mass and the mass of the substance give the moles of the substance. The 10-gram sample of neon (Ne) has the fewest atoms. Thus, option b is correct.

<h3>What are moles?</h3>

Moles of the substance are the ratio of the molar mass and the mass of the substance. The moles of each atom with respect to the Avagadro's number (Nₐ) is given as,

Moles = mass ÷ molar mass

  • Moles of carbon (C) = 10 ÷ 12

= 0.83 Nₐ atoms

  • Moles of neon (Ne) = 10 ÷ 20

= 0.5 Nₐ atoms

  • Moles of fluorine (F) = 10 ÷ 19

= 0.52 Nₐ atoms

  • Moles of nitrogen (N) = 10 ÷ 14

= 0.7 Nₐ atoms

  • Moles of oxygen (O) = 10 ÷ 16

= 0.63 Nₐ atoms

Therefore, option b. 10 gm neon has the fewest atoms.

Learn more about moles here:

brainly.com/question/11884840

#SPJ1

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Answer:

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if the elements are in a same group then they will be having same number of valence electron.

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Elements that are usually dull, brittle and do not conduct electricity are know as______.
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Explanation:

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7 0
2 years ago
Please help me
Wittaler [7]

Answer:

pH = 6.999

The solution is acidic.

Explanation:

HBr is a strong acid, a very strong one.

In water, this acid is totally dissociated.

HBr + H₂O  →  H₃O⁺  +  Br⁻

We can think pH, as - log 7.75×10⁻¹² but this is 11.1

acid pH can't never be higher than 7.

We apply the charge balance:

[H⁺] = [Br⁻] + [OH⁻]

All the protons come from the bromide and the OH⁻ that come from water.

We can also think [OH⁻] = Kw / [H⁺] so:

[H⁺] = [Br⁻] + Kw / [H⁺]

Now, our unknown is [H⁺]

[H⁺] =  7.75×10⁻¹² + 1×10⁻¹⁴ / [H⁺]

[H⁺] = (7.75×10⁻¹² [H⁺] + 1×10⁻¹⁴) /  [H⁺]

This is quadratic equation:  [H⁺]² - 7.75×10⁻¹² [H⁺] - 1×10⁻¹⁴

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[H⁺] = 1.000038751×10⁻⁷

- log [H⁺] = pH → 6.999

A very strong acid as HBr, in this case, it is so diluted that its pH is almost neutral.

8 0
3 years ago
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