Oxygen (O2) has a molar mass of 32.0 g/mol . Part A What is the root-mean-square speed of an oxygen molecule at a temperature of 293 K ? Exnr ower i n met ere

4.0 moles of krypton gas are in a 0.20m3 container. The pressure is 1.663 x 105 Pa.  a, What is the temperature (to the nearest K)? The volume contracts to 0.10m3. The pressure is held constant.  b, How much work was done by the gas during the volume contraction?  c, What is the temperature after the volume contraction (to the nearest K)?

Assume a person has lungs that can hold V = 5.5 L of air (at 1 atm), and their body temperature is currently T = 35.5° C. a. How many moles of air does the average human have in their lungs when they breath in?

For a planet to have an atmosphere, gravity must be sufficient to keep the gas from escaping The escape speed a particle needs to escape the earth's gravitational attraction is 1.1 x 10 m/s. The motion of projectiles never depends on mass, so this escape speed applies equally to rockets and to molecules in the earth's upper atmosphere. Part A At what temperature does the rms speed of nitrogen molecules equal the escape speed? Express your answer in kelvins. ΜΕ ΑΣΦΑ T- Submit Part B T- Request An At what temperature does the mms speed of hydrogen molecules equal the escape speed? Express your answer in kelvins. VAZO Submit ? K K

7 of 13 At an altitude of 11,000 m (a typical cruising altitude for a jet airliner), the air temperature is -59.0° C and the air density is 0.467 kg/m³. The molar mass of air is 28.8 g/mol. Part A What is the pressure of the atmosphere at that altitude? (Note: The temperature at this altitude is not the same as at the surface of the earth, so the equation Р— Ро ехp (- Mgy doesn't apply.) RT Express your answer with the appropriate units. HA ? Value Units Submit Request Answer

At what temperature (in Kelvin) will the diffusion coefficient for the diffusion of species A in metal B have a value of 5.92 × 10-16 m2/s, assuming values of 2.8 x 10-6 m?/s and 225,000 J/mol for Do and Qd, respectively? i K

Re 460 J of work must be done to compress a gas to half its initial volume at constant temperature. Part A How much work must be done to compress the gas by a factor of 7.00, starting from its initial volume? Express your answer with the appropriate units. HẢ W Value Units %3D