General Chemistry Exam

Avogadro's number represents:

• The number of atoms in 1 mole of any element.

• The number of molecules in 1 gram of a compound.

• The volume of 1 mole of gas at STP.

• The energy in one mole of a substance.

Which of the following contains the greatest number of particles?

• 1 mole of oxygen gas (O2)

• 1 mole of carbon atoms

• 1 mole of glucose (C6H12O6)

• All contain the same number of particles.

The molar mass of CO2 is:

• 12 g/mol

• 44 g/mol

• 32 g/mol

• 28 g/mol

If the theoretical yield is 20 g and the actual yield is 15 g, what is the percent yield?

• 75%

• 80%

• 85%

• 90%

Percent yield can never be:

• 0%

• 50%

• 100%

• Greater than 100%

The SI unit of pressure is:

• Pascal (Pa)

• Atmosphere (atm)

• Torr

• Bar

1 atm is equal to:

• 760 Torr

• 101.3 Pa

• 10.1 kPa

• 1 bar

Boyle's law states that:

• Pressure is directly proportional to volume.

• Pressure is inversely proportional to volume.

• Pressure is directly proportional to temperature.

• Pressure is independent of volume.

For a fixed amount of gas at constant temperature, if the volume is halved, the pressure:

• Is halved

• Is doubled

• Remains the same

• Becomes zero

Boyle's law can be expressed as:

• P1V1=P2V2

• P1/T1=P2/T2

• V1/T1=V2/T2

• PV=nRT