![]() ![]() So we're left with just joules per kelvin and that's negative 59.1 joules per kelvin. Carbon dioxide is 1 mole, carbon dioxide, and then we use our delta s surroundings as a conversion factor negative 130.1 joules per kelvin mole, and we see our moles cancel and our grams cancel. Advantages of Dry Ice temperature: -78.5C, three times the refrigeration capacity of water ice per unit weight (heat of sublimation 645 kJ/kg) keeps. So we need to convert the grams into moles 44.01 gram. This extreme cold makes the solid dangerous to handle without protection from frostbite injury. We add 2 d 73.15, so that gives us negative 130.1 joules per kelvin mole, but we want to know the joules per kelvin when we just have 20 grams of dry ice undergoing sublimation. Dry ice sublimates at 194.7 K (78.5 ☌ 109.2 ☏) at Earth atmospheric pressure. Let'S make that joules instead of kilo, joules 25200 joules per mole divided by the kelvin temperature, it sublimes at negative 79.5. This 1 is provided sublimation divided by the temperature, so it will be negative twin to 25 point. ![]() To do that, we recognize that delta s surroundings is equal to negative delta h of the system. The sublimation-pressure equation covers the temperature range from 50 K to the vapor-liquid-solid triple point at 273.16 K. ![]() First, we need to calculate delta s of the surroundings in units of joules per kelvin mole.
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