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Review Drill & Stoichiometry Test

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Chm II Drill: Calculate the mass of (NH4)2SO4 in mg produced when 1.12 mL NH3 gas reacts is excess H2SO4 in the following rxn:NH3 + H2SO4 (NH4)2SO4

Chm II Homework

- Review PP-11
- Complete the worksheet attached to the Poly website.

- All matter is made up of tiny particles
- The particles are in constant motion
- All collisions are elastic

- Force per unit area
- Caused by collisions against a surface
- Gas measured in pressure

- kPa: kilopascal (Std Unit)
- Pascal: newton/sq. meter
- Atmosphere (Atm):
- mm Hg:

- 101.3 kPa (to be changed)
- 1.00 Atm
- 760 mm Hg or Torrs
- 30.0 inches Hg
- 1013 millibars

- Boyle’s Law
- Charles’ Law
- Gay Lussac’s Law
- Dalton’s Law
- Graham’s Law

- The pressure & volume of a gas at constant temperature are inversely proportioned
P1V1 = P2V2 = K

- The volume and temperature of a gas at constant pressure are directly proportioned
V1V2

T1T2

= = K

- The pressure and temp. of a gas at constant volume are directly proportioned
P1P2

T1T2

= = K

- Combination of the three formulas
P1V1P2V2

T1 T2

=

- A gas’s volume is directly proportioned to its number of moles
V1V2

n1n2

= = K

P1V1/n1T1 =

P2V2/n2T2 =

K

New Combination

P1V1P2V2

n1 T1 n2T2

= = K

PV = nRT

- The total pressure = the sum of the partial pressures
PT = P1 + P2 + etc

- The velocities of particles are inversely proportioned to the square root of their masses
v1M2

v2M1

=

Calculate the new volume of 5.0 L of gas when its pressure is doubled and its temperature is tripled:

Calculate the volume of a gas at STP when it occupies 150.0 mL at 227oC under

303.9 kPa pressure:

Calculate the volume of 3.0 moles of gas at

-23oC under 83.1 kPa pressure.

Drill: Calculate the number of moles of gas occupying 831 mL under 250 kPa at 227oC & Pass in Lab

- Review PP 11
- Complete the attached worksheet

Calculate the volume of a gas at STP when it occupies 80.0 mL at 273oC under 303.9 kPa pressure:

Calculate the ratio of the velocities of He gas to HCl gas:

Calculate the mass of CO2 occupying 83.1 mL under 25 GPa at 227oC

Ideal Gas Law

PV = nRT

D or r =

m

V

m/n

MW =

MW = m/n

n = m/MW

PV = nRT

PV =

mRT

MW

mRT

PV

MW =

Drill: Calculate the volume in mL of 4.0 g bromine gas at 127oC under 83.1 kPa pressure.

- Review PP 11
- Complete the attached assignment & turn it in tomorrow

Are there any questions on previous material?

Calculate the density of carbon dioxide at 27oC under 83.1 kPa pressure

m

V

mRT

PV

D =

MW =

m

V

m RT

V P

D =

MW =

DRT

P

MW P

RT

MW =

D =

Review & Collect Drill & HW

Are there any questions on previous material?

Calculate the volume of a gas at STP when it occupies 80.0 mL at 127oC under 303.9 kPa pressure:

5 Calculate the volume of 4.0 moles of gas under 83.1 kPa pressure at 127oC:

Calculate the molecular mass of 50 g of gas occupying 831mL under 250 MPa at 227oC

Calculate the mass of 831 mL of CO2 at 167oC under 150 kPa pressure:

The total pressure of a system is 120.0 kPa. The partial pressure of gas A is 112.0 kPa. Determine the pressure of gas B

The total pressure of a system is 150.0 kPa. The system contains 50 % A, 30 % B, & 20 % C. Determine the pressure of each gas.

Drill: Calculate the mass of CO2 occupying 83.1 mL under 25 MPa at 477oC

Calculate the velocity HBr when the velocity Be is 270 m/s:

Calculate the volume of H2 formed at 27oC under 150 kPa

when 6.8 mg NH3 decomposes making N2 & H2.