Based on the phase diagram of CO₂ shown in Figure 11.39(b), describe the state changes that occur when the temperature of CO₂ is increased from 190 K to 350 K at a constant pressure of (a) 1 atm

Video transcript

Hey everyone today, we've given the phase diagram of iodine and we're told that at a constant pressure of 2 80 M, two atmospheres To find the phase change of iodine when it has decreased from an initial temperature of 48.15 Kelvin to 368.15 Kelvin. So before we do anything, we need to actually make sure that we know what terms we're dealing with. So we're told that the pressure is happening at a at pressure, a constant pressure of 2 80 M. Now pressure isn't a scale here. But just for the sake of our reference, let's just say to A T. M. Is right right about here. Let's say this line here is our to A T. M. Line to A T. M. And the temperatures decreased from 48.15 kelvin to 3 68. kelvin. However, temperature is given in degrees Celsius. So we need to convert Calvin two degrees Celsius Now 4 .15 Kelvin - 73.15 gives us about 215 Kelvin and 43 68.15 kelvin. Well 3 .15 Kelvin - 73.15 brings us to about 95 Kelvin. It's a 95 or sorry, degrees Celsius. This is also degrees Celsius, not kelvin degrees Celsius. So with that in mind and let's just say again, temperature is not to scale. But let's just say if this is 184 degrees Celsius, then 215 the upper range would fall a little a little past that. Let's say this is too 15 degrees Celsius. And at a constant pressure of two atmospheres that puts our point right over here. So this is our starting and a final temperature of 95 degrees Celsius. So if this is 114 degrees Celsius, then that means that 95 degrees Celsius will be a little below that, let's say right about here, that is 95 degrees Celsius. And if we put that again to our constant pressure of 2 80 M, that puts us solely right about here. So, this is our final. So after the temperature has decreased, which means a Hedin has gone from a phase of liquid as it is in here. Let's write this little meter. It goes from a liquid at a pressure of two atmospheres at 215°C or 488.15 Kelvin To a solid at that same pressure. But a 95°C, it goes from liquid to solid. So we get iodine iodine liquid two solid. Hi Dean solid. So I hope this helps. And I look forward to seeing you all in the next one