9. The critical temperature of oxygen is 155 K. What does this mean? (a) Oxygen is very cold. (b) The critical pressure must be > 155 bar. (c) It is impossible to produce liquid oxygen by compression alone if its temperature is > 155 K. (d) It is critical to keep oxygen at a temperature of 155 K.

4(a) A car tyre (an automobile tire) was in ated to a pressure of 24 lb in−2(1.00 atm = 14.7 lb in−2) on a winter’s day when the temperature was −5 °C. What pressure will be found, assuming no leaks have occurred and that the volume is constant, on a subsequent summer’s day when the temperature is 35 °C? What complications should be taken into account in practice? (b) A sample of hydrogen gas was found to have a pressure of 125 kPa when the temperature was 23 °C. What can its pressure be expected to be when the temperature is 11 °C?

A 0.516 g sample of a metal, M, reacts completely with sulfuric acid according to M(s) + H,SO,(aq) MSO,(aq) + H,(g) A volume of 223 ml. of hydrogen is collected over water; the water level in the collecting vessel is the same as the outside level. Atmospheric pressure is 756.0 Torr, and the temperature is 25 "C. The vapor pressure of water at 25 "C is 23.8 Torr. Calculate the molar mass of the metal. g/mol molar mass:

The mass of the Earth's troposphere, the lower part of the atmosphere, is approximately 4.4*1018 kg. a) Estimate the volume of the troposphere in cubic meters at standard state (P = 1 atm, T = 298 K, R = 0.0821 atm-L/mol-k). b) The average mass of water in the troposphere is 1.3*1013 kg. Calculate the concentration of water vapour in the troposphere in mg/m3. What would the concentration of water vapour in the troposphere in ppmv be? c)

The gravitational force exerted by an object is given by F=mg,where F is the force in newtons, mis the mass in kilo-grams, and gis the acceleration due to gravity (9.81 m/s²).(a) Use the definition of the pascal to calculate the mass (in kg)of the atmosphere above 1 m² of ocean.(b) Osmium (Z=76) is a transition metal in Group 8B(8) andhas the highest density of any element (22.6 g/mL). If an os-mium column is 1 m² in area, how high must it be for its pressureto equal atmospheric pressure?

A breathing mixture used by deep-sea divers contains helium, oxygen, and carbon dioxide. What is the partial pressure of oxygen at a barometric pressure of 101.4 kPa, if PHe  = 82.5 kPa and  PCO2  = 0.4 kPa?

Vinegar contains 5.00% acetic acid by mass and has a density of 1.01 g/mL. What mass(in grams) of acetic acid is present in 5.00 L of vinegar?

4. Which gas law is NOT incorporated into the combined gas law? O Boyle's law Gay-Lussac's law O Ideal gas law O Charles law

The density of methane gas is measured at four sets of conditions. Under which set of conditions is the density of CH4 the greatest? (a) T = 300K, P = 1 atm; (b) T = 325K, P = 1 atm; (c) T = 275K, P = 2 atm; (d) T = 300K, P = 2 atm.

2. A sample of vapor weighing 0.368 g filled a Florence flask when heated in a water bath at 95.0°C. The actual volume of the flask was 128.4 mL and the barometric pressure was 747 torr. Calculate (a) the volume of the vapor at STP and (b) the molar mass of the volatile liquid. (Use the approach applied in the Introduction and on the data sheet.)