91影视

(II) If 61.5 L of oxygen at 18.0掳C and absolute pressure of 2.45 atmis compressed to 38.8 L, and at the same time, the temperature is raised to 56.0掳C, what will the new pressure be?

(II) You buy an 鈥渁irtight鈥� bag of potato chips packaged at sea level and take the chips on an airplane flight. When you take the potato chips out of your 鈥渃arry-on鈥漛ag, you notice it has noticeably 鈥減uffed up.鈥� Airplane cabins are typically pressurized at 0.75 atm, and assuming the temperature inside an airplane is about the same as inside a potato chip processing plant, by what percentage has the bag 鈥減uffed up鈥� in comparison to when it was packaged?

(II) A helium-filled balloon escapes a child鈥檚 hand at sea level and 20.0掳C. When it reaches an altitude of 3600 m, where the temperature is 5.0掳C and the pressure only 0.68 atm, how will its volume compare to that at sea level?

Question 36:(III) A sealed test tube traps of air at a pressure of 1.00 atm and temperature of 18掳C. The test tube鈥檚 stopper has a diameter of 1.50 cm and will 鈥減op off鈥� the test tube if a net upward force of 10.0 N is applied to it. To what temperature would you have to heat the trapped air in order to 鈥減op off鈥� the stopper? Assume the air surrounding the test tube is always at a pressure of 1.00 atm.

Question 37:(III) An air bubble at the bottom of a lake 41.0 m deep has a volume of\({\bf{1}}{\bf{.00}}\;{\bf{c}}{{\bf{m}}^{\bf{3}}}\). If the temperature at the bottom is 5.5掳C and at the top 18.5掳C, what is the radius of the bubble just before it reaches the surface?

Calculate the number of molecules/m³in an ideal gas at STP.

Question 39:(I) How many moles of water are there in 1.000 L at STP? How many molecules?

Question: Which is larger, 1 C掳 or 1 F? Explain why.

Question40:(II) Estimate the number of (a) moles and (b) molecules of water in all the Earth鈥檚 oceans. Assume water covers 75% of the Earth to an average depth of 3 km.

Calculate the rms speed of helium atoms near the surface of the sun at a temperature of about 6000K.