Calculate the pressure of a helium sample at -207.3°C and 768 mL if it exerts a pressure of 175 kPa at 25.0°C and 925 mL.

Question

Quizplus · Accepted Answer

We can use the combined gas law to solve this problem:

(P1 x V1) / T1 = (P2 x V2) / T2

where P1 = 175 kPa, V1 = 925 mL, T1 = 25.0°C + 273.15 = 298.15 K,
V2 = 768 mL, and T2 = (-207.3°C + 273.15) = 65.85 K

Plugging in these values and solving for P2:

(175 kPa x 925 mL) / 298.15 K = (P2 x 768 mL) / 65.85 K
Simplifying and solving for P2:

P2 = (175 kPa x 925 mL x 65.85 K) / (768 mL x 298.15 K)
P2 = 46.6 kPa

Therefore, the pressure of the helium sample at -207.3°C and 768 mL is 46.6 kPa. The answer is B.

Calculate the Pressure of a Helium Sample at -207