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Helen [10]
3 years ago
7

3. If a gas exerts 1.2 atm of pressure at a volume of 31 liters and a temperature of 360K, how many moles of the gas are in the

container.​
Chemistry
1 answer:
Mashcka [7]3 years ago
5 0
The answer is 1.26 Mol

n = PV/RT= (1.2 atm)(31 L) / (0.0821 )(360K) = 1.26 mol H2


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When particles that attract each other are allowed to come to together, energy is ______
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Answer:

Released

Explanation:

When particles that attract each other come together, energy is usually released. The combination of the two particles is expected to result in a lower energy system. This lower energy system will be more stable than the different individual particles.

Hence, as this lower energy system is formed, the excess energy originally possessed by the particles is evolved hence energy is released when particles that attract each other are allowed to come together.

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Which is a physical change?
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Making toast is a physical change.



*** Please mark this answer as the Brainliest and leave a Thanks if I helped you! :) ***

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3 years ago
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What is the molarity of a solution prepared by dissolving 8 grams of BaCl2 in enough water to make a 450. 0 mL solution? (Hint:
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Molarity is the molar concentration of the solute dissolved in a volume of a solution. The molarity of the solution prepared by dissolving barium chloride will be 0.085 M.

<h3>What is molarity?</h3>

Molarity is the ratio of the moles of the solute to that of the volume of the solution in Liters. It can be given as,

\rm Molarity = \dfrac{moles}{Volume}

Here, moles of the barium chloride can be given by the mass and the molar mass and volume is given as 0.450 L.

Substituting values in the equation:

\begin{aligned}\rm Molarity &= \rm \dfrac{mass}{Molar \;mass\times Volume}\\\\&= \dfrac{8}{208.23\times 0.450}\\\\&= 0.085\;\rm M\end{aligned}

Therefore, 0.085 M barium chloride is the molar concentration.

Learn more about molarity here:

brainly.com/question/26873446

4 0
2 years ago
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irinina [24]

Its molecular formula : C₆H₁₂O₆

<h3>Further explanation  </h3>

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\tt [30]n=180\rightarrow n=6\\\\(CH_2O]_6=C_6H_{12}O_6

3 0
3 years ago
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02.01]In the 1800s, John Dalton's atomic theory was that atoms are indivisible. Later, subatomic particles such as neutrons, ele
Luda [366]
The last one is the correct answer. The atomic structure can be broken down which is what the findings concerning protons, electrons and neutrons showed. The theory was thus modified. What remained was no chemical reaction could affect the basic structure of an atom.

Still the last choice is still true. The first choice is your second best answer because of what I wrote in the last sentence of the above paragraph. 

Last Choice <<<<< answer
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