A sample of hydrogen gas was collected at [tex]25 \,^\circ \text{C}[/tex] with a volume of [tex]250 \, \text{m}^3[/tex]. What is the new temperature if the volume is increased to [tex]300 \, \text{m}^3[/tex]?



Answer :

To solve the problem, we will use Charles's law, which states that for a given mass of an ideal gas at constant pressure, the volume is directly proportional to its absolute temperature. This can be written as:

[tex]\[ \frac{T_1}{V_1} = \frac{T_2}{V_2} \][/tex]

Where:
- \( T_1 \) is the initial temperature,
- \( V_1 \) is the initial volume,
- \( T_2 \) is the final temperature,
- \( V_2 \) is the final volume.

Given:
- Initial temperature, \( T_1 = 25 \) degrees Celsius,
- Initial volume, \( V_1 = 250 \) cubic meters,
- Final volume, \( V_2 = 300 \) cubic meters.

First, we need to convert the initial temperature from Celsius to Kelvin. The conversion formula is:

[tex]\[ T(K) = T(C) + 273.15 \][/tex]

Thus,

[tex]\[ T_1(K) = 25 + 273.15 = 298.15 \text{ K} \][/tex]

Next, we can use Charles’s law to find the final temperature \( T_2 \) in Kelvin:

[tex]\[ \frac{T_1}{V_1} = \frac{T_2}{V_2} \][/tex]

Rearranging to solve for \( T_2 \):

[tex]\[ T_2 = \frac{T_1 \cdot V_2}{V_1} \][/tex]

Substituting the known values:

[tex]\[ T_2 = \frac{298.15 \text{ K} \cdot 300 \text{ m}^3}{250 \text{ m}^3} = 357.78 \text{ K} \][/tex]

Finally, convert the final temperature back to degrees Celsius:

[tex]\[ T_2(C) = T_2(K) - 273.15 \][/tex]

[tex]\[ T_2(C) = 357.78 - 273.15 = 84.63 \text{ degrees Celsius} \][/tex]

So, the new temperature when the volume is 300 cubic meters is approximately 84.63 degrees Celsius.

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