Omar Alayoub

Block 4

February 23, 2009

IB HL Chemistry Year 1

∆H of Combustion of Propane Gas

Research Question:

To design a lab in order to find the enthalpy change of combustion of Propane Gas.

Equation:

C3H8+ 5O2 →3CO2 + 4H2O              ∆HC = ?

Materials:

  • Propane Gas
  • Water
  • Graduated Cylinder
  • Beaker
  • Bunsen Burner
  • Tripod
  • Thermometer (Max  100°C)
  • Stopwatch
  • Matches

Variables:

  • Manipulative:
  • Volume of Propane (cm3 )
  • Responding:
  • Temperature change of water (C°)
  • Controlled:
  • Water
  • Time (s)

Procedure:

  1. Measure 100 cm3  of water using a graduated cylinder.
  2. Pour the water into a beaker.
  3. Place the beaker over the tripod.
  4. Turn the gas on, and light the Bunsen burner.
  5. Record the initial temperature of the water.
  6. Place the beaker over the Bunsen burner and leave it heat for 1 minute.
  1. Track time with Stopwatch.
  1. Record the final temperature.
  2. Record the uncertainties of your materials to process your data.
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Data Collection:

Time:        60 sec

Volume of Water:  100 cm3  

Initial Temperature: 23°C

Final Temperature:  52° C

∆T = 52°C – 23°C

ΔT = 29°C

Data Processing:

  • Finding out how many moles of propane were combusted.
  • Formula:  PV= nRT
  • P→ 101.3 kPa which is equal to R.T.P
  • V→ Volume of gas per second X time
  • R→ 8.314
  • T→ 23°C
  • N→ Unknown Variable

n =   PV  .

      RT

n = (101.3kPa)(5.35cm3 x 60 ...

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