One morning, you find it very difficult to wake up. Something was making a huge racket all night and kept you from sleeping. Immediately you go to warm up some water for coffee, but the coffee pot won’t turn on because there is no power. You look outside and it turns out the loud noises were caused by an alien invasion which has also knocked out the powerlines. Naturally, your mind starts to race with thoughts of how to make your coffee. a. Determine how much heat you will need to get 0.472 L of 18.0 oC water to begin boiling (in other words, get it to 100.0 °C). The specific heat capacity of water is 4.18 J/g* oC. b. Without electricity, you’ll have to be clever about where to get the heat from. Conveniently, you have a supply of Unknownium oxide (Uk2O3) that will react with hydrochloric acid (HCl) according to the equation below: Uk2O3 (s) + 6 HCl (aq) → 2 UkCl3 (aq) + 3 H2O (g) Given that... 4 Uk + 3 O2 → 2 Uk2O3 4 HCl + O2 → 2 H2O + 2 Cl2 2 UkCl3 → 2 Uk + 3 Cl2 What is the overall ΔH of this reaction? ΔH (-1,043.8 kJ/mol) Δ H (-191.2 kJ/mol) Δ H (574.0 kJ/mol) c. How many moles of Uk2O3 do you need to react in order to produce the exact amount of heat for warming your water?
One morning, you find it very difficult to wake up. Something was making a huge racket all night and kept you from sleeping. Immediately you go to warm up some water for coffee, but the coffee pot won’t turn on because there is no power. You look outside and it turns out the loud noises were caused by an alien invasion which has also knocked out the powerlines. Naturally, your mind starts to race with thoughts of how to make your coffee.
a. Determine how much heat you will need to get 0.472 L of 18.0 oC water to begin boiling (in other words, get it to 100.0 °C). The specific heat capacity of water is 4.18 J/g* oC.
b. Without electricity, you’ll have to be clever about where to get the heat from. Conveniently, you have a supply of Unknownium oxide (Uk2O3) that will react with hydrochloric acid (HCl) according to the equation below:
Uk2O3 (s) + 6 HCl (aq) → 2 UkCl3 (aq) + 3 H2O (g) Given that...
4 Uk + 3 O2 → 2 Uk2O3
4 HCl + O2 → 2 H2O + 2 Cl2 2 UkCl3 → 2 Uk + 3 Cl2
What is the overall ΔH of this reaction?
ΔH (-1,043.8 kJ/mol) Δ H (-191.2 kJ/mol) Δ H (574.0 kJ/mol)
c. How many moles of Uk2O3 do you need to react in order to produce the exact amount of heat for warming your water?
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Now that you’ve had your coffee, it’s time to show these aliens they chose the wrong planet to invade. You join a task force whose mission is to develop a
chemical reaction that will fuel a weapon capable of fighting the aliens. Intel comes in that the aliens are extremely weak to cold, so what type of reaction (exothermic or endothermic) should you use for the weapon? Why? -
The aliens are defeated, which means it is time to party! There is a massive buffet to celebrate, where you ingest 4,712 g of glucose (C6H12O6). The reaction for the digestion of glucose is shown below:
C6H12O6 + 6 O2 → 6 CO2 + 6 H2O ΔH = -2,803 kJ/mol
How many kilocalories will you have to burn to work off such a massive (though well deserved) meal? (1 kilocalorie = 4,184 J)
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