7. Gases

Why was the appearance of oxygen in the atmosphere a crucial event in the history of life?

Which of the following best explains the cause of the pressure that a gas exerts on the walls of its container according to the ideal gas law?

Under which conditions of temperature and pressure would a gas behave most like an ideal gas?

A 9.00 L tank contains 75.1 grams of fluorine gas (F_2) at a temperature of 355 K. What is the pressure inside the tank? (R = 0.0821 L·atm·mol^{-1}·K^{-1})

In a refrigeration system, what is the physical state of the refrigerant as it enters the compressor?

Which statement best describes the mass of a gas according to the ideal gas law?

Which law can be used to calculate the number of moles of a contained gas when pressure, volume, and temperature are known?

Why is Venus hotter than Mercury despite being further from the Sun?

How many molecules of N_2 are present in a 400.0 mL container at 780 mm Hg and 135°C? (Use R = 0.0821 L·atm·mol^{-1}·K^{-1} and 1 atm = 760 mm Hg.)

Which type of gas sample will behave most like an ideal gas (i.e., best approximated by $PV=nRT$)?

Which of the following can result from excessive withdrawal of groundwater?

Which of the following represents the formula for Boyle's Law?

Which of the following statements about gases is correct according to the ideal gas law?

Which of the following changes is most likely to result in an increase in the volume of a gas, assuming all other variables are held constant?

Using the ideal gas law, how many moles of gas are present in a 20 L container at a pressure of 2 atm and a temperature of 400 K? (Use R = 0.0821 L·atm·mol^{-1}·K^{-1})