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Answer the following questions based on the P - T phase diagram of CO_(2) : (a) CO_(2) at 1 atm pressure and temperature -60^(@)C is compressed isothermally. Does it go through a liquid phase ? (b) What happens when CO_(2) at 4 atm pressure is cooled from room temperature at constant pressure ? (c) Describe qualitatively the changes in a given mass of solid CO_(2) at 10 atm pressure and temperature -65^(@)C as it is heated up to room temperature at constant pressure. (d) CO_(2)is heated to a temperature 70^(@)C and compressed isothermally. What changes in its properties do you expect to observe ? |
| Answer» <html><body><p></p>Solution :(a) No, `CO_(2)` is in steam from at 1 atm pressure and `-60^(@)C` <a href="https://interviewquestions.tuteehub.com/tag/temperature-11887" style="font-weight:bold;" target="_blank" title="Click to know more about TEMPERATURE">TEMPERATURE</a>. <br/> It its isothermal compression is done i.e. increasing pressure with constant temperature then it <a href="https://interviewquestions.tuteehub.com/tag/directly-955045" style="font-weight:bold;" target="_blank" title="Click to know more about DIRECTLY">DIRECTLY</a> converts into solid form without coming through liquid. (<a href="https://interviewquestions.tuteehub.com/tag/sublimation-1231130" style="font-weight:bold;" target="_blank" title="Click to know more about SUBLIMATION">SUBLIMATION</a>) <br/> (b) `CO_(2)` is in gaseous state at 4 atm pressure and `27^(@)C` temperature. <br/> If it is clled at constant pressure then it directly converts into gaseous state without coming through liquid. It intersects at curve III. <br/> (c) `CO_(2)` is in solid form at <a href="https://interviewquestions.tuteehub.com/tag/10-261113" style="font-weight:bold;" target="_blank" title="Click to know more about 10">10</a> atm pressure and `-60^(@)C` temp. <br/> If it is heated at constant pressure then first it comes in liquid form and then in gaseous form because it intersects the fusion and vaporization curve. <br/> (d) It is seen from phase diagram of `CO_(2)` that the above `70^(@)C` temperature it doesn.t have liquid area. Then <a href="https://interviewquestions.tuteehub.com/tag/also-373387" style="font-weight:bold;" target="_blank" title="Click to know more about ALSO">ALSO</a> it reacts as an ideal gas with increase in pressure.</body></html> | |