## anonymous 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.

1. Photon336

@CountryBoy15 Look at this |dw:1444191107393:dw|

2. Photon336

well it's called sublimation solid goes directly to gas without going to the liquid phase $(Solid) -> (Gas)$

3. Photon336

the solid ice goes directly to the gas phase without passing through the liquid phase

4. NotTim

Maybe ask this as a new question, countryboy15

5. Photon336

$pV = nRT$ the temperature and number of particles (moles n) are constant so $p_{1}V_{1} = p_{2}V_{2}$

6. Photon336

We are looking for V_{2} so we isolate $V_{2} = \frac{ P_{1}V_{1} }{ P_{2}}$

7. Photon336

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

Plug the numbers above into this equation $\frac{ P_{1}V_1 }{ P_{2} } = V_{2}$

9. Photon336

$\frac{ (1L)(2.66atm) }{ (5.33atm) } = 0.4 L~estimate$ the pressure went up so the volume went down. I didn't have a calculator i just estimated it.

10. Photon336

that's essentially what boyles law is pressure goes up volume goes down. opposite is true too

11. anonymous

0.499 and thanks