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13 December, 06:05

Imagine that you have a 7.00 LL gas tank and a 3.50 LL gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 125 atmatm, to what pressure should you fill the acetylene tank to ensure that you run out of each gas at the same time

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  1. 13 December, 06:11
    0
    We should fill the acetylene tank to a pressure of 100 atm

    Explanation:

    Step 1: Data given

    Volume tank 1 = 7.00 L

    Volume tank 2 = 3.50 L

    Tank 1 is filled with oxygen and has a pressure of 125 atm

    Step 2: The balanced equation

    2 C2H2 + 5 O2 → 4 CO2 + 2 H2O

    Step 3: Calculate the pressure of acetylene

    P (O) * V (O) = n (O) * R * T and P (A) * V (A) = n (A) * R * T

    If we assume both tanks are at the same temperature, then we can write as followed:

    P (O) * V (O) / P (A) * V (A) = n (O) / n (A)

    ⇒with n (O) / n (A) = 5/2

    ⇒with P (O) = 125atm

    ⇒V (O) = 7L

    ⇒V (A) = 3.5L

    then (125 * 7) / (P (A) * 3.5) = 5/2

    P (A) = 100 atm

    We should fill the acetylene tank to a pressure of 100 atm
  2. 13 December, 06:13
    0
    The answer is 250 atm.

    The tanks need to have the same amount of air. The smaller one is half the volume of the larger one, so it will have double the pressure. 125*2=250
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