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Ugo [173]
4 years ago
10

The sum of the numbers of protons and neutrons in a nucleus of an atom answer

Chemistry
1 answer:
kipiarov [429]4 years ago
6 0
An atom's mass number is the sum of the numbers of protons and neutrons in its nucleus. The atomic weight is the average mass of all of the isotopes of that element.
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Magnesium carbonate decomposes on heating to form magnesium oxide and carbon dioxide as shown.
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What is the simplest formula of a compound if a sample of the compound contains 0.221 mol X, 0.442 mol Y, and 0.884 mol Z? chemP
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Answer:

XY₂Z₄

2.35 mol Z

Explanation:

A sample of the compound contains 0.221 mol X, 0.442 mol Y, and 0.884 mol Z. We can find the simplest formula (empirical formula) by <em>dividing all the numbers of moles by the smallest one</em>.

X: 0.221/0.221 = 1

Y: 0.442/0.221 = 2

Z: 0.884/0.221 = 4

The simplest formula is XY₂Z₄.

The molar ratio of X to Z is 1:4. The moles of Z in a sample that contained 0.588 moles of X is:

0.588 mol X × (4 mol Z/1 mol X) = 2.35 mol Z

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3 years ago
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Which of the following indicates the cathode rays has a large charge to mass ratio?
Anna007 [38]

Answer:

Gggg

Explanation:

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Use the periodic table to write the electron configuration for rubidium (Rb) in noble has notation
Alexxx [7]

Answer:

Rb: [Kr] 5s  

Step-by-step explanation:

Rb is element 37, the first element in Period 5.

It has one valence electron, so its valence electron configuration is 5s.

The noble gas configuration uses the symbol of the previous noble gas as a shortcut for the electron configurations of the inner electrons.

The preceding noble gas is Kr, so the electron configuration is Rb: [Kr] 5s.

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When there is a shifting of party allegiances within the electorate, it is called?
IgorLugansk [536]

Party realignment a shifting of party alliances within the electorate.

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Founded in 2019, the Alliance Party is a centrist American political party. It is connected to the American Party of South Carolina, the Minnesota Independence Party, the Connecticut Independent Party, and the Florida Reform Party.

to learn more about party alliances go to -

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2 years ago
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