Calorimetry
Determine the amount of heat (KJ) required to get 1.75 liters of water from 15° C to 70°C.
402.9 KJ
Calculate the rate of heat flow (KW) through a silver flat sheet of area of 3.2 m2 and 1.5 cm of thickness, if the temperature difference at both ends is 55° C.
4,928 KW
In an engine, a gas is compressed adiabatically to half its volume. In doing so, 1,850 J of work is done on the gas. (a) How much heat flows into or out of the gas? (b) What is the change in the internal energy of gas?
Q = 0
dU = -1,850 J
Calculate the total change in entropy if 4,500 J of heat transfer occurs within a vessel which has an internal temperature of 250 °C.
8.6 J/K
What´s Profe Allan´s favorite Marvel character?
Rocket Racoon
Calculate the amount of heat (KJ) required to melt and 5 oz ice cube if it started as solid at 0°C and ended up as water at 0°C.
46.6 KJ
Calculate the area of a brick wall with a 7.6 cm thickness, if the heat flow allowed is 70 W and the temperature gradient is 1.8° C
3.5 m2
A gas expands isothermally, performing 4.5 KJ of work in the process. Determine (a) the change in the internal energy of the gas and (b) the heat (KJ) absorbed during the expansion.
dU = 0
Q = W = 4.5 KJ
A sample of 2.5 lb of ice is taken from -40 °C to -5 °C. Estimate the change in entropy.
309.9 J/K
At Despicable Me, what are the names of Gru´s 3 daughters?
Margo, Edith and Agnes
Determine the amount of heat (KJ) required to get 1.75 liters of water from -15° C to 70°C.
1,150.7 KJ
Determine the temperature difference between both ends of a wood log (cylinder shape with a 10 cm radius), if its heat flow is 0.035 W and its length is 30 inches.
8.5 °C
A gas at pressure of 2 atm undergoes an isobaric expansion from 3 to 6 liters. How much work is done by the gas?
606 J
What is the change in entropy of 0.8 kg of liquid ethyl alcohol at 78 °C when it is turned into a gas at 78°C?
1,937.3 J/K
At Star Wars, who is Han Solo´s friend and companion?
Chewbacca
Calculate the amount of heat (KJ) needed to be removed in order to get 450 g of water from 60°C to -10°C.
-272.3 KJ
A steel metal bar has a heat flow ratio of 9.5 KW. If its length and width are 25 and 2 ft respectively and its temperature gradient between both ends of it is 15°C, how thick (cm) is the steel bar?
30 cm
In an isovolumetric process, 250 liters of water are evaporated from a temperature of 25°C to 115°C. Determine the change in the internal energy, the heat (KJ) needed and the work done.
W = 0
dU = Q = 651,025 KJ
What is the change of entropy of 250 milliliters of ethyl alcohol at -114 °C when it is frozen at -114°C? Ethyl alcohol density = 0.79 kg/l.
-129.2 J/K
At Game of Thrones, which house has a direwolf as their sigil?
House Stark
How much heat (KJ) is needed to get 3.1 lb of water from -5°C to 130° C?
4,315.4 KJ
A lightbulb generates 95 W of heat, which is dissipated through a glass bulb that has a radius of 3 cm and is 1 mm thick. What is the difference in temperature between the inner and outer surfaces of the glass?
40°C
Determine the change in internal energy (KJ) of 2.6 liter of water at 55°C when it is fully boiled from liquid to gas. which results in 4,200 liters of steam at 100°C. Assume the process is done at constant atmospheric pressure.
5,941.8 KJ
A sample of water had a change of entropy of 3.05 KJ/K, if it went from 15 to 75°C, how much water (lb) was in the sample?
9.3 lb
What´s Mr Allan´s college degree?
Chemical Engineering