Question

Hydrogen chloride gas is shipped in a container under 5,100 mm Hg of pressure that occupies 20.1 liters at 29°C. How many liters of gas would be produced at STP?
1.7 x 10-5 L
8.3 x 10-3 L
120 L
150 L

Answer 1

The gas will occupy 120 L at STP.

We can use the Combined Gas Laws .

In 1982, chemists redefined STP as 1 bar and 0 °C (273.15 K).

p_1 = 5100 mmHg × (1 atm/760 mmHg) × (1.013 bar/1 atm) = 6.798 bar

T_1 = (29 + 273.15) K = 302.15 K

p_1V_1/T_1 = p_2V_2/T_2

V_2 = V_1 × p_1/p_2 × T_2/T_1

= 20.1 L × (6.798 bar/1 bar) × (273.15 K/302.15 K) = 120 L