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Simple gas law: new pressure, volume or temperature of a fixed amount of gas

This type of question, asked 3 times: 25 Jun 2022, 25 Jul 2022, 10 Apr 2023. All 3 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    25 Jun 2022

    142
    A rigid nitrogen tank stored inside a laboratory has a pressure of 30 atm30\text{ }atm at 06:00 am when the temperature is 27 ∘C27\ ^{\circ}C. At 03:00 pm, when the temperature is 45∘C45^{\circ}C, the pressure in the tank will be atm. [nearest integer]

  2. Question 2

    25 Jul 2022

    142
    A sealed flask with a capacity of 2dm32dm^{3} contains 11 g11\text{ }g of propane gas. The flask is so weak that it will burst if the pressure becomes 2MPa2MPa. The minimum temperature at which the flask will burst is  ∘C\ ^{\circ}C. [Nearest integer] (Given: R=8.3 J K−1 mol−1R = 8.3\text{ }J{\text{ }K}^{- 1}{\text{ }mol}^{- 1}. Atomic masses of CC and HH are 12u12u and 1u1u respectively.) (Assume that propane behaves as an ideal gas.)

  3. Question 3

    10 Apr 2023

    59
    At constant temperature a gas is at a pressure of 940.3 mmHg940.3\text{ }mmHg. The pressure at which its volume decreases by 40%40\% is ___mm Hg. (Nearest Integer)