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marissa [1.9K]
3 years ago
14

Percent Composition Calculations

Chemistry
1 answer:
AysviL [449]3 years ago
5 0

Answer:

\boxed{\text{17.76 \% by mass}}

Explanation:

\text{The mass of one molecule of NH$_{3}$ is:}\\\text{14.01 u N + 3.024 u H = 17.034 u}\\\\\text{mass $\%$ H} =\dfrac{3.024}{17.034} \times 100 \%} =\textbf{17.76 \%}\\\\\text{Ammonia contains }\boxed{\textbf{17.76 \% H by mass}}

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Chromium occurs naturally as four isotopes: 50cr with a mass of 49.9460 amu, 52cr with a mass of 51.9405 amu, 53cr with a mass o
bearhunter [10]
Hello!

The most stable isotope of Chromium is ⁵²Cr with a mass of 51,9405 amu.

We know that because of the information that we can find in the periodic table. Which information is that? The atomic weight of the element. Atomic weights are calculated taking into account the relative abundances of each isotope of the element. The isotope that is the most abundant one will influence more the atomic weight that is found in the periodic table. 

For chromium, its atomic weight, that we can find on the periodic table, is 51,99 amu. The isotope weight that is nearest to this atomic weight is ⁵²Cr with a mass of 51,9405 amu, so that will be the most stable isotope. 

Have a nice day!
3 0
3 years ago
A central atom that is sp3 hybridized could bind up to how many other atoms?
inna [77]

Answer: up to 4 other atoms.

Explanation:

  • <em>Hybridization sp</em>³ means that the atom has 4 equal orbitals formed by the combination of 1 s and 3 p orbitals.

  • Each of these sp³ orbitals is a place for a chemical bonding.

  • Hence, since each orbital is able to bind a different atom, you conclude that <em>a central atom that is sp³ hydridized could bind up to 4 other atoms.</em>

This is precisely the case for carbon (C) atoms.

Carbon has atomic number 6. So its electron configuration is 1s² 2s²p².

The four electrons in the level 2, those shown in 2s² 2p², are in two different orbitals: two are in the orbital 2s and two are in the orbitals 2p.

This diagram shows how those 4 electrons fill the orbitals

  • 2s⇅ 2px↑ 2py↑

The two 2s electrons have lower energy level than the 2px and 2 py electrons, but the difference is not too big.That is why one of the electrons in the 2s ortital can be promoted to the empty 2pz orbital, and you get 4 equal hydridized ortibals, so called sp³.

And that is why, carbon (C) ends up with 4 equal (hydridized) orbitals which can bind up to 4 different atoms, including other carbon atoms, and so, form long chains and, virtually, infinite compounds.

5 0
4 years ago
The following list contains some common polyatomic ions. Using the charge on these ions and the idea of valence, predict the for
SSSSS [86.1K]

Answer: Na_2CO_3 or Sodium carbonate.

              KMnO_4 or Potassium permanganate

Sodium ion carries 1 + charge whereas carbonate ion carries overall charge of -2. So for every carbonate ion, two sodium ions combine to balance the charges and thus form a stable compound, Na_2CO_3

Potassium ion carries 1 + charge where as permanganate ion carries overall charge of -1. So for every permanganate ion, one potassium ion combines to balance the charges and thus form a stable compound,  KMnO_4

The predicted formulas are shown in the attached image.


5 0
3 years ago
Read 2 more answers
An atom of sodium can transfer its one valence electron to an atom of...
seropon [69]

Answer:

I believe it is B,fluorine to complete the octet rule

Explanation:

4 0
3 years ago
Read 2 more answers
Grade
Anuta_ua [19.1K]

Answer:

pp

Explanation:

4 0
4 years ago
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