Which sample of water has the lowest vapor pressure?

• 100 mL at 50 degrees celcius
• 200 mL at 30 degrees celcius
• 300 mL at 40 degrees celcius
• 400 mL at 20 degrees celcius

A sealed flask containing 1.0 mole of H₂(g) and a sealed flask containing 2.0 moles of He(g) are at the same temperature. The two gases must have equal

• masses
• volumes
• average kinetic energies
• numbers of molecules

Two basic properties of the gas phase are

• a definite shape and a definite volume
• a definite shape but no definite volume
• no definite shape but a definite volume
• no definite shape and no definite volume

The temperature at which the solid and liquid phases of matter exist in equilibrium is called its

• melting point
• boiling point
• heat of fusion
• heat of vaporization

A real gas differs from an ideal gas because the molecules of real gas have

• some volume and no attraction to each other
• some volume and some attraction for each other
• no volume and no attraction for each other
• no volume and some attraction for each other

Which temperature change would cause the volume of a sample of an ideal gas to double when the pressure of the sample remains the same?

• from 200 ^oC to 400 ^oC
• from 400 ^oC to 200 ^oC
• from 200 K to 400 K
• 400 K to 200 K

A 3.00-liter sample of gas is at 288 K and 1.00 atm. If the pressure of the gas is increased to 2.00 atm and its volume is decreased to 1.50 liters, the Kelvin temperature of the sample will be

• 144 K
• 288 K
• 432 K
• 576 K

At the same temperature and pressure, which sample contains the same number of moles of particles as 1 liter of O₂(g)?

• 1 L Ne(g)
• 2 L N₂(g)
• 0.5 L SO₂ (g)
• 1 L H₂O(l)

Helium is most likely to behave as an ideal gas when it is under

• high pressure and high temperature
• high temperature and low pressure
• Low temperature and low pressure
• High pressure and low temperature

According to Reference Table H, what is the vapor pressure of propanone at 45°C?

• 22 kPa
• 33 kPa
• 70 kPa
• 98 kPa