At constant pressure, a gas occupies a volume of 1.0 L at 298K. What volume will the gas occupy at 373K?

a
0.80 L
b
4.0 L
c
1.0 L
d
1.3 L

1 answer

To determine the volume of a gas at a different temperature while the pressure is held constant, you can use Charles's Law, which states that the volume of a gas is directly proportional to its temperature (in Kelvin) when pressure is constant. The formula is:

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

Where:

  • \( V_1 \) is the initial volume (1.0 L)
  • \( T_1 \) is the initial temperature (298 K)
  • \( V_2 \) is the final volume (unknown)
  • \( T_2 \) is the final temperature (373 K)

Rearranging the formula to solve for \( V_2 \):

\[ V_2 = V_1 \times \frac{T_2}{T_1} \]

Substituting in the values:

\[ V_2 = 1.0 , \text{L} \times \frac{373 , \text{K}}{298 , \text{K}} \]

Calculating the right side:

\[ V_2 = 1.0 , \text{L} \times 1.252 = 1.252 , \text{L} \]

Thus, the gas will occupy approximately 1.25 L.

None of the given answer choices match this closely, but the value is closest to option d (1.3 L).