The coolant in an automobile radiator is kept at a pressure higher than atmospheric pressure. Why is this desirable? The radiator cap will release coolant when the gauge pressure of the coolant reaches a certain value, typically 15 lb/in.² or so. Why not just seal the system completely?
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- A 7.97 m3 tank contains 10.5 g of chlorine gas (Cl2) and an absolute pressure of 5.50 × 105 Pa. The mass per mole of Cl2 is 70.9 g/mol. (a) Determine the temperature of the tank in Celsius. (b) Later, the temperature of the tank has dropped to 33 °C and, due to a leak, the pressure has dropped to 3.30 × 105 Pa. How many grams of chlorine gas have leaked out of the tank?What is the average (rms) velocity of nitrogen (diatomic) gas molecules at 20 degrees Celsius?Q 06: Let's imagine that at the beginning of a journey a truck tire has a volume of 40,000 cm3 and an internal pressure of 180 kPa. The temperature of the tire is 16°C. By the end of the trip, the volume of the tire has increased to 45,000 cm3 and the temperature of the air inside the tire is 45°C. What is the tire pressure at the end of the journey?
- A krypton-84 atom has a mass of 1.39 x 10-25 kg. (a) What temperature (in K) would a gas composed entirely of krypton-84 atoms have to be at in order for the rms speed of the atoms to equal the escape speed from Earth, 1.12 x 10 m/s? K (b) What temperature (in K) would a gas composed entirely of krypton-84 atoms have to be at in order for the rms speed of the atoms to equal the escape speed from the Moon, 2.37 x 10 m/s? KA gas condensed in a cylinder with a nozzle is initially at p_1=2000 Pa, V_1= 2.0 l, and t_1=300 K. a) If the volume decreases to 0.50 L while the temperature remains low, what is the new pressure?b) If in a) the temperature increases to 400 K when the volume changes, what will be the new pressure?On a chilly 10°C day, you quickly take a deep breath—all your lungs can hold, 4.0 L. The air warms to your body temperature of 37°C. If the air starts at a pressure of 1.0 atm, and you hold the volume of your lungs constant (a good approximation) and the number of molecules in your lungs stays constant aswell (also a good approximation), what is the increase in pressure inside your lungs?
- A cylinder of cross sectional area 0.0287 m^2 is filled with an ideal monoatomic gas. A mass of 47.4 kg is placed on top of the piston which is free to move without friction. The piston starts 0.61m above the base of the cylinder. The gas in the piston is initially at a temperature of 454.0 K and the pressure in the lab is 100kPa.How many moles of gas are in the cylinder?#6