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Over [174]
3 years ago
7

If you initially have a volume of 4 L and a temperature of 300K. Then you decreased the volume to 2 L, what is the new temperatu

re? Choose the appropriate gas law and use a calculator to complete the problem.
Chemistry
1 answer:
ASHA 777 [7]3 years ago
3 0

Answer:

T₂ = 150 K

Explanation:

Given data:

Initial volume = 4 L

Initial temperature = 300 K

Final volume = 2 L

Final temperature = ?

Solution:

The given problem will be solve through the Charles Law.

According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

T₂ = T₁V₂/V₁  

T₂ = 300 K × 2L / 4 L

T₂ = 600 L.K / 4 L

T₂ = 150 K

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Answer:

16974J of energy are required

Explanation:

The energy required is:

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q = dH*m

* The energy required to increase the temperature of liquid water from 0°C to 75°C

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The first energy is:

q = m*S*ΔT

<em>m = Mass water = 25g</em>

<em>S is specific heat of ice = 2.03J/g°C</em>

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q = 25g*2.03J/g°C*15°C

q = 761.3J

The second energy is:

q = dH*m

<em>m = Mass water = 25g</em>

<em>dH is heat of fusion of water = 80cal/g</em>

q = 80cal/g*25g

q = 2000cal * (4.184J/1cal) = 8368J

The third energy is:

q = m*S*ΔT

<em>m = Mass water = 25g</em>

<em>S is specific heat of water= 4.184J/g°C</em>

<em>ΔT is change in temperature = 75°C-0°C = 75°C</em>

q = 25g*4.184J/g°C*75°C

q = 7845J

The energy is: 7845J + 8368J + 761J =

16974J of energy are required

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The detectives reported that an overturned bowl of grapes and watermelon was found at the scene as well as a broken glass that had contained wine. Scott knew that some fruit juices like that of watermelon give a positive reaction to the acid phosphatase test but with  more time that of the semen fluid because the reaction is a very slow one.

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