Problem 1: Page 2 of 5 -ZOOM Youtube video: Dry ice sublimation. www.youtube.com

Question

Problem 1:

Page 2 of 5 -ZOOM Youtube video: Dry ice sublimation. www.youtube.com/watch?yJoH7sdCaadg A perfectly reasonable question to ask at this point ie whu don't we see sublimation often? Does water sublinate? The answers become a bat more clear when we look at another plot Critical point Liquid Melting Freezing | Solid / Vaporization Condensati Gas Sublination Triple point Deposition Temperature What we see here is a conceptual plot of pressure versus temperature lor a any substance usually looks something like this). ntially, the way you read thi (substance) at (x-coordinate) C and apply (y montinate of stance be in?" This helps to explain why we klo not pressure is simply too high! So.. what happeng if substance (the plot for pressure, what phase will the sub t typially s Suimation of water: atmospheric surg

Explanation / Answer

Problem 2 :

Lv = heat of vapourisation = 539 cal /g

Lf = latent heat of fusion = 80 cal/g

m = mass of ice = 400 g

using conservation of heat

Q = m Lf + m c (100 - 0) + m Lv

Q = (400) (80) + (400) (1) (100) + (400) (539)

Q = 287600 cal

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