Question 4
Gas Laws50 cm3 of a gas was collected over water at 10 °C and 765 mm Hg. Calculate the volume of the gas at s.t.p. if the saturated vapour pressure of water at 10 °C is 5mm Hg.
- A.49.19 cm3
- B.48.87 cm3
- C.48.55 cm3
- D.48.23 cm3
Show the answer and explanation
Answer: D (48.23 cm3)
Explanation
Dry gas pressure = 765 − 5 = 760 mmHg. V2 = 50 × (760/760) × (273/283) = 48.23 cm3.