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CountryBoy15

  • one year ago

need help please help Name and describe the phase change that occurs when solid carbon dioxide (dry ice) is placed in an open container at room temperature.

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  1. Photon336
    • one year ago
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    @CountryBoy15 Look at this |dw:1444191107393:dw|

  2. Photon336
    • one year ago
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    well it's called sublimation solid goes directly to gas without going to the liquid phase \[(Solid) -> (Gas) \]

  3. Photon336
    • one year ago
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    the solid ice goes directly to the gas phase without passing through the liquid phase

  4. NotTim
    • one year ago
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    Maybe ask this as a new question, countryboy15

  5. Photon336
    • one year ago
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    \[pV = nRT \] the temperature and number of particles (moles n) are constant so \[p_{1}V_{1} = p_{2}V_{2}\]

  6. Photon336
    • one year ago
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    We are looking for V_{2} so we isolate \[V_{2} = \frac{ P_{1}V_{1} }{ P_{2}}\]

  7. Photon336
    • one year ago
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    just plug in the numbers \[1 atm = 101.3kpA \] \[\frac{ 270 }{ 101.3} = 2.66atm = P_{1}\] \[\frac{ 540 }{ 101.3} =5.33 atm = P_{2}\] \[V_{1} = 1 L \]

  8. Photon336
    • one year ago
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    Plug the numbers above into this equation \[\frac{ P_{1}V_1 }{ P_{2} } = V_{2}\]

  9. Photon336
    • one year ago
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    \[\frac{ (1L)(2.66atm) }{ (5.33atm) } = 0.4 L~estimate \] the pressure went up so the volume went down. I didn't have a calculator i just estimated it.

  10. Photon336
    • one year ago
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    that's essentially what boyles law is pressure goes up volume goes down. opposite is true too

  11. countryboy15
    • one year ago
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    0.499 and thanks

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