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Roman55 [17]
3 years ago
8

A gas cylinder contains exactly 15 moles of oxygen gas (O2) how many molecules of oxygen are in a cylinder

Chemistry
2 answers:
butalik [34]3 years ago
8 0
When you say mhello les do uou mean moecules
Tanzania [10]3 years ago
3 0
The answer is 9.03 × 1024<span> molecules hope it helps.</span>
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How many hybrid orbitals are found in CCl4? o one o two o three o four​
BlackZzzverrR [31]

Answer:

I Believe it is 4 orbitals s,p,p,p or aka sp^3

Explanation:

4 0
2 years ago
Read 2 more answers
Effective nuclear charge, Zeff, is defined as:
Alborosie

Answer:

The effective nuclear charge for a valence electron in oxygen atom: Z_{eff} = 4.55

Explanation:

Effective nuclear charge  [Z_{eff}] is the net nuclear charge experienced by the electron in a given atom. It is always less than the actual charge of the nucleus [Z], due to shielding by electrons in the inner shells.

<em>It is equal to the difference between the actual nuclear charge or the atomic number (Z) and the shielding constant (s).  </em>

\Rightarrow Z_{eff} = Z - s

<u>For an oxygen atom</u>-

Electron configuration: (1s²) (2s² 2p⁴)

<em>The atomic number (actual nuclear charge): </em>Z = 8

The shielding constant (s) for a valence electron can be calculated by using the Slater's rules:

⇒ s = 5 × 0.35 + 2 × 0.85 = 1.75 + 1.7 = 3.45

<u><em>Therefore, the effective nuclear charge for a valence electron in oxygen atom is:</em></u>

Z_{eff} = Z - s = 8 - 3.45 = 4.55

<u>Therefore, the effective nuclear charge for a valence electron in oxygen atom:</u> Z_{eff} = 4.55

6 0
3 years ago
Summary about helium
Zinaida [17]

Answer: Helium is an type of air that can be used to inflate balloons, balls,  and other things that require air. The carbon dioxide we breath out is similar to this helium.

Hope this helps!

6 0
3 years ago
Someone help me please i’ll give brainly
drek231 [11]
<h2>Hey There!</h2><h2>_____________________________________</h2><h2>Answer:</h2>

\huge\boxed{Sublimation}

<h2>_____________________________________</h2><h2>Sublimation:</h2>

Sublimation is a process in which the solid molecules gain energy from their surrounding and they now have enough energy to overcome the force of attraction with the neighboring molecules, thus they escape into the surrounding without going through the liquid phase, that means they directly jump to the vapor phase.

<h2>_____________________________________</h2><h2>Endothermic</h2>

Those process which absorb energy from their surrounding to form the product are called endothermic process. Since the SUBLIMATION requires additional energy, it is an endothermic change.

<h2>_____________________________________</h2><h2>Best Regards,</h2><h2>'Borz'</h2><h2 />
7 0
2 years ago
Silver nitrate, AgNO3, can be used to test for the presence of chloride ions in solution, because it readily forms a precipitate
velikii [3]

Answer:

\boxed{\text{9.0 mL}}

Explanation:

1. Write the balanced chemical equation.

AgNO₃ + HCl ⟶ AgCl + HNO₃

2. Calculate the moles of HCl

\text{Moles of HCl} =\text{30.0 mL HCl} \times \dfrac{\text{0.45 mmol HCl}}{\text{1 mL HCl}} = \text{13.5 mmol HCl}

3. Calculate the moles of AgNO₃.

\text{Moles of AgNO}_{3} =\text{13.5 mmol HCl} \times \dfrac{\text{1 mmol AgNO}_{3}}{\text{1 mmol HCl}} = \text{13.5 mmol AgNO}_{3}

4. Calculate the volume of AgNO₃

c = \text{13.5 mmol AgNO}_{3} \times \dfrac{\text{1 mL AgNO}_{3}}{\text{1.5 mmol AgNO}_{3}} = \text{9.0 mL AgNO}_{3}

The titration will require \boxed{\textbf{9.0 mL}} of AgNO₃.

4 0
3 years ago
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