? asked in Science & MathematicsChemistry · 10 years ago

A 15.0 L sample of CO gas initially has a temperature of 23.5oC at a pressure of 1.16 atm. What is the new pre?

A 15.0 L sample of CO gas initially has a temperature of 23.5oC at a pressure of 1.16 atm. What is the new pressure, in atm, if the volume is changed to 12.5 L and the temperature is decreased to 18.7oC?

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  • 10 years ago
    Favorite Answer

    The standard equation for finding the solutions is PV/NT = PV/NT and number of moles stays the same so

    1.16 x 15 / 296.5( T in Kelvin) = X x 12.5 / 291.7.

    solve to find your new pressure in ATM is 1.369465

    Correct sig figs shows 1.37

  • Anonymous
    10 years ago

    Use the Combined Gas Law that looks like this:

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

    P1= 1.16 atm

    V1= 15.0 L

    T1= 23.5 degrees celsius. For all Gas Law problems Celsius has to be converted to Kelvin by adding 273.15 K to the given celsius temperature

    So 23.5 celsius + 273.15 K = 296.65 K

    Similarly

    P2= ? (we have to find this)

    V2= 12.5 L

    T2= 18.7 degrees celsius + 273.15 K =291.85 K

    Now plug in these values into the formula

    (1.16 atm) * (15.0L) / (296.65 K) = (P2) * (12.5 L) / (291.85 K)

    Cross multiply so u multiply 1.16 * 15.0 * 291.85 and divide by 296.65 * 12.5

    This will give u your new pressure or P2 = 1.37 atm

    Source(s): Pre Med student
  • 4 years ago

    There are different strategies that is used... extremely of the mixed or appropriate gas regulation, i will use here 2 rules. a million...Boyle's regulation: P1xV1 = P2xV2. 3.5atm x 40 seven.3L = 2.05atm x V2. V2 = (3.5 x 40 seven.3) / 2.05 = 80.8L. 2...Charles' regulation. V1xT2 = V2xT1 (27.5°C + 273 = 3 hundred.5K = T2 (35°C + 273 = 308K = T1.) 80.7L x 3 hundred.5K = V2 x 308K V2 = (80.8 x 3 hundred.5) / 308 = seventy 8.8L = answer a)...

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