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Between periods of a hockey game a Zamboni spreads 8.55 L ofwater across the surface of a hockey rink. To freeze thisvolume of water at 0oC what is the valueof Î...

Question

Between periods of a hockey game a Zamboni spreads 8.55 L ofwater across the surface of a hockey rink. To freeze thisvolume of water at 0oC what is the valueof ΔHsys? The density of water is 1.00g/mL. (Enter only your numericanswer with 1 decimal place - do not include units but make sureyour final answer is calculated in units of kJ. It is notnecessary to include a + sign, however if your answer is negativeplease include a - sign)

Between periods of a hockey game a Zamboni spreads 8.55 L of water across the surface of a hockey rink. To freeze this volume of water at 0oC what is the value of ΔHsys? The density of water is 1.00g/mL. (Enter only your numeric answer with 1 decimal place - do not include units but make sure your final answer is calculated in units of kJ. It is not necessary to include a + sign, however if your answer is negative please include a - sign)



Answers

The temperature of a 0.700 $\mathrm{kg}$ cube of ice is decreased to $-150^{\circ} \mathrm{C} .$ Then energy is gradually transferred to the cube as heat while it is otherwise thermally isolated from its environment. The total transfer is 0.6993 $\mathrm{MJ}$ . Assume the value of $c_{\text { ice given in Table } 18-3}$ is valid for temperatures from $-150^{\circ} \mathrm{C}$ to $0^{\circ} \mathrm{C} .$ What is the final temperature of the water?

Calculation for the above problem here. Given most off, Ice Cube is equal to 14 point 7 g myself. Water is equal to 3 to 4 crumb. The amount of feed here that amount off heat required for melting. One mole of ice He's 6.2 Killer Joel two. World 8.5 grandma Vices amount off. It is equal to kill is amount of it is equal to when 4.7 grandma water multiply one more as to all divided by 18.2 Grandma is toe multiply, she explained to zero killer Joel divided by one more one mola is to all multiply 10 raised to the power three Joel one Killer Joel Que musical too. 4.91 Multiply dangerous to the power three tall So the amount of feet produced by water is calculated Using yeah, que is equal to mass. He'd keep the city of water. Delta T here am is equal to 3 to 4 g and hate capacity of what is equal to 4.184 Joel per gram and chance in temperature is equal to unknown. Yeah, so here we have Delta three is equal to amount off, divided by moss into heat. Capacity of water is equal to by putting values 4.91 multiply 10 Raised to the power three. Joel do I did buy mhm 3 24 g multiply four point 18 for Joel per gram is equal to 3.62 degree Celsius, and to you we find change. We calculate a change in temperature is 3.62 degree Celsius.

Okay. So today we were going to be Calculating the heat released when 65.5 g of water at 55°C schools to ice At 0°C.. And so the heat of solidification here is gonna be 80 calories program. And then we're going to take 65.5 g of water and multiply it. Bye. Um Mhm. We're going to multiply it by one calorie program Times 55.5 0. What you gonna equal 36 02.5 calories. And then to get the energy required, we're going to multiply 65.5 g Times 80 calories Program. And to get 5 to 40 calories. And we're gonna add those two together. Which gets eight 8 42.5 calories total. Okay.

A solution for the above question here. But more love is too. Oh, they will, too. 74.6 scrum into one mole divided by 18.2 grass is equal to 4.14 more. Yeah, yeah, for first transition hungry here. Delta. Yes. Off System V is equal to Delta. Edge off the system, divided by temperature. You think Belgium you 4.14 multiply 6070 Divided by 27 three Jewell Pirmin is equal to 911 Chill Kilo. Pirmin party. Lou Pearlman, India. Good. Delta s off. The surrounding is equal to minus Delta age off. The system, divided by temperature, is equal to 4.14 Multiply six. Do you know what? Mm. Here, behave. 60 mhm. 70 Divided by 2. 73. Jewell Permal is equal to Yes. Yeah, minus 91.1. Jewell. Particular Permal. And here Delta s off. The universe is equal to Delta is off the system. Plus, Delta is after surrounding is equal to 91.1 minus 91.1 is equal to zero. So here, Gus, no net change

So for a melting process we have We know that Delta G not is, by definition, speak of zero. That's a property of face change transitions. This is something that's a little bit beyond the scope. This video beacon look happen. Understand why that's the case. And that's gonna equal girl two H minus two. Delta s, as Delta G always does. And so since we have ah, Delta H given to us and we're looking for this Delta s this is the Delta. Ask more specifically of the system. Um, everything here is referring to the system. We can solve that. You know, Delta ass of the system is going to equal Delta H over the temperature. I'm and so bug me in here. Now we have to be a little bit more careful than just up. Actually. Should probably note that this is what we have here. We have not showing that we have, like, one mole of reaction believed to take care of that. First, let's take a little aside. Here we have 74 0.6 grams of water, and we would like to know, um, how many moles we have and so have to divide by the micro weight of water, which is 18.2 grams per mole, and that will let us know that we have, ah, four point 13 moles of water. Now, the reason why we need to bring that up is because we want to multiply that by the fact that we have 6.1 killer drools Permal as our Delta Asia and so you could multiply by 4.13 moles. He's more units will cancel out. And so now we're in business. We have 24.8, uh, killer jewels released during this reaction works. You need this value later. That's also going to our Delta H shares so we can plug in, um, and now we and we're gonna want this in jewels, cause that's assets normally in jewels. And so 24,800 Jules over the temperature, which is zero degrees Celsius. That's to 73 Calvin. And so we can plug it all in, and we're gonna find that we have adults s of 91 point one drools for Calvin. Now, from here, we're going to figure out the delta ass of the surroundings. And so that's always equal to negative Delta H of the system over the temperature. And so the Delta Nation is just almost 24.8, and so negative that is negative. 24.8 till it Jules. Ah, again, we should probably put into jewels because that's generally the unit of entropy. Divide that by the temperature, which is to 73 again, and you'll see that could be the exact opposites. At 91.1, it's gonna be negative. 91.1 jewels for Calvin You'll probably be seeing there's a really huge similarity. And that's because this reaction is actually a beauty equilibrium, which is what our lost questions asked. The delta s of the universe, remember, is Delta s of the system, plus Stell Toe asked of the surroundings and so adding the two up. Very obviously we have negatives are the the system is pause it 91.1 that surrounding this negative 91.1, we get zero jewels per kelvin, and that's a property of a reaction being equilibrium which were already time we we knew, uh, going into this. That's a fact about of melting and another face change. Reacts is


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