CHEM 1001/CHM 1020/ Chm1025C/CHM1032C†††††††† Name:________
Module 6 Sample Pretest
Module Six Part E Gas Law Problems††††††††††††††††††††††††††† 20 points
1.† A sample of a gas has a volume of 100 mL when measured at 25 oC and
†760 mmHg.† What volume will the gas occupy at 25 oC and 380 mmHg?
2. The volume of a gas is 100.0 mL at 27 oC.† At what temperature in degrees Celsius would the volume of the gas be 200.0 mL, assuming the pressure remains constant.
Daltonís Law of Partial Pressures
3. Calculate the dry volume in milliliters of 200 mL of hydrogen gas collected over water at 25 oC at 760 torre pressure with the temperature remaining constant.† (The partial pressure of water vapor at 25 oC is 23.8 torre.)
4.† A sample of gas occupies 100.0 L at 710.0 torre and 27 oC.† Calculate the pressure in torre if the temperature is changed to 127 oC while the volume remains constant.
5.†† A 1.5 mole sample of a gas occupies 25.0 L at 758 torre and 27oC. Calculate the Volume of the gas, if more molecules are injected into the vessel increasing the moles to 2.5 moles, provided the pressure and the temperature do not change.
Ideal Gas Equation-Combined Gas Laws
5. Calculate the number of moles of nitrogen gas in a 5.00 L cylinder at 27 oC and 4 atm pressure. R = 0.0821 L atm/ K mole )
How much does this volume of gas weigh?