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3 years ago

Explain why the mole is used as a counting unit for mass

Chemistry

1 answer:

SSSSS [86.1K]3 years ago

3 0

Answer:

It isn't.

Explanation:

It is a counting unit for "things" — atoms, molecules, ions, etc. — and these things all have different masses.

For example, a chemist may know that one atom of Cu reacts with one atom of S to form one molecule of CuS.

Cu + S ⟶ CuS

She knows that 1 mol of Cu (6.022 × 10²³ atoms of Cu) has a mass of 63.55 g and 1 mol of S (6.022 × 10²³ atoms of S) has a mass of 32.06 g.

By measuring out 63.55 g of Cu and 32.06 g of S, she knows that there are just enough atoms of each element to react with each other.

Thus, the mole has enabled her to count atoms.

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san4es73 [151]

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3 years ago

An atom is the most __________ unit of living and nonliving things. (Help I will mark brainliest if ya help, and the first one t

ziro4ka [17]

The correct answer to your question is

Basic. it is the is the basic unit of non living things.

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3 years ago

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Nonmetals form _________ bonds by sharing electrons to complete their valence shell and increase stability.

katrin [286]

Non metals form ionic bonds by gaining and losing electrons to complete their valence she'll and increase stability. Metals form covalent bonds by sharing electrons.

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3 years ago

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What is the charge on the phosphorus atom in the polyatomic ion: PO4-3

oee [108]

Explanation:

The given radical is PO₄³⁻

To solve this problem, we need to understand what oxidation number entails.

The extent of the oxidation of each atom is expressed by the oxidation number.

Here are some rules for assigning them:

Elements in an uncombined state or elements that combines with one another, their oxidation number is zero.
The charge on an ion is its oxidation number
In an neutral compound, algebraic sum of all the oxidation numbers of all atoms is zero.
In a radical, the algebraic sum of all the oxidation numbers of the ions is equal to the charge on them.

Oxygen is known to have an oxidation number of -2;

PO₄³⁻

P + 4(-2) = -3

P -8 = -3

P = -3 + 8 = +5

The charge on phosphorus is +5

learn more:

Oxidation number brainly.com/question/2086855

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3 0

4 years ago

A sample of gaseous neon atoms at atmospheric pressure and 0 °c contains 2.69 * 1022 atoms per liter. the atomic radius of neon

omeli [17]

Explanation

Radius of neon atom : 69 pm = $69\times 10^{-12} m$

Volume occupied by the one atom: $\frac{4}{3}\pi r^3$

$=\frac{4}{3}\times 3.14\times(69\times 10^{-12} m)^3=1.37\times 10^{-30} m^3$

given that $2.69\times 10^{22}$ atoms are present in 1L

1 L = 0.001 $m^3$

The volume occupied by the $2.69\times 10^{22}$ neon atoms

$2.69\times 10^{22}\times 1.37\times 10^{-30} m^3=3.68\times 10^{-8} m^3$

Fraction of volume occupied by the neon atom:

$=\frac{3.68\times 10^{-8} m^3}{0.001 m^3}=3.68\times 10^{-11} m^3$

$3.68\times 10^{-11} m^3$

The fraction of of volume occupied by the neon atom is very less than the 1 L which indicates the presence of large amount of empty space between the atoms of the gas.

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3 years ago