• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

MOLECULAR WEIGHT OF A VOLATILE LIQUID-Lab report

Extracts from this document...

Introduction

MOLECULAR WEIGHT OF A VOLATILE LIQUID CHEMISTRY HL JAIME CASTRO A. 10-2 PRESENTED TO: KEITH RIGBY ANGLO COLOMBIAN SCHOOL EXPERIMENTAL SCIENCES DEPARTMENT RESULTS: Table1. Showing the data recorded during the experiment Trial 1 2 Mass of flask /(g) �0.01g 112.86 112.86 Mass of flask and gas /(g) �0.01g 113.66 113.66 Mass of gas /(g) �0.01g 0.80 0.80 The volume of the flask was of 325 (� 2.5) cm3 which equals 3.25x10-4 (� 2.5 x10-6 )m3, the value of the volume will now only be considered in SI units. The temperature was of 92 �0.1�C which equals 365�0.1�K, the value of the temperature will now only be considered in SI units. The Pressure will be considered as the atmospheric pressure of Bogota which is 75 kPa which equals 75000 Pa, the value of the pressure will now only be considered in SI units. ...read more.

Middle

To use this law we can consider the following values for volume, pressure and temperature; the value of the constant is 8.314 when working with SI units. Temperature: 365�0.1�K Volume: 3.25x10-4 � 2.5x10-6 m3 Pressure: 75000 Pa So if we use the previously established values in the equation we will get the number of moles of gas inside the flask. To calculate the percentage uncertainty of this value we need to add up the percentage uncertainty of the pressure, the temperature and the volume Percentage uncertainty of the volume Uncertainty: � 2.5 x 10-6 m3 Volume: 3.25 x 10-4 m3 Percentage uncertainty = 0.77% Percentage uncertainty of the temperature Uncertainty: �0.1�K Temperature: 365�K Percentage uncertainty = 0.03% So the percentage uncertainty of the number of moles of the gas is of 0.8%. ...read more.

Conclusion

CONCLUSION: Taking in count that the liquid used in this experiment was a cycloalkane and that the empirical formula of cycloalkanes is, we can determine what cycloalkane was used by just dividing the molar mass of the liquid by the empirical mass of cycloalkanes. The result of this division was 7.1 which tells us that the molecular formula for the cycloalkane used in the experiment is which is the molecular formula for cycloheptane, therefore we can conclude that the cycloalkane used in this practical was cycloheptane. EVALUATION: The total percentage uncertainty of this practical was of 2.05% which is a really small percentage which makes our results very accurate. However I can suggest repeating the practical for 2 or 3 times so that an average of the results can be obtained and the possibility of a random error can be reduced. ?? ?? ?? ?? ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Chemistry essays

  1. Determining the Molar Mass of Volatile Liquid

    The mass of a 250 cm3 Erlenmeyer flask together with a boiling stone and an aluminum foil cap was weighed and recorded accurately on the electronic balance to the nearest 0.001g 2) Small pinhole in the foil cap was made with a pin 3)

  2. Ionic and Molecular Compounds Lab

    tastes bitter, slippery Conclusion: The lab has given a conclusion that ionic compounds conduct electricity, and molecular compounds do not conduct electricity. A blue litmus paper will turn red upon its contact with an acid and stay blue when it contacts base or a neutral substance.

  1. Change of Potential Difference in Voltaic Cells Lab Report

    0.8, 1.0 dm-3mol (M)), make sure to change the filter paper and zinc sulfate solution each time. Method of Data Collection In terms of methodology, this data table represents the data collected of the readings present from the voltmeter for the first trial of the experiment.

  2. Research question - How many molecules are there in a liquid drop?

    Table showing calculated averages and the final average mass of the four different liquids, along with the number of moles and the number of molecules. Average mass of one drop of the five different number of drops of the four liquids, in grams (� 0.01 g)

  1. hess's law

    Graph 1 showing the Change in Temperatures when hydrated copper (II) sulphate was added to water [Temperature against Time]: Graph 2 showing the Change in Temperatures when anhydrous copper (II) sulphate was added to water [Temperature against Time]: Data Processing and Presentation: Molar Mass of CuSO4 = 159.5 g Molar Mass of CuSO4 .

  2. To determine the molecular mass of an unknown alkali metal carbonate, X2CO3.

    Part 2: Determining number of moles in 2.0g of substance Z. Since 2.0g was used to make 250cm3, 25cm3 of solution is assumed to have 0.20g of X2CO3. Moles of HCl = 0.0037moles. Therefore, 0.20g had 0.00185moles of X2CO3. Therefore, molecular mass of X2CO3 = = 108.1g/mol Atomic mass of

  1. Chemistry thermo lab, Hess's Law.

    I will now calculate the uncertainties: First, we calculate the uncertainty for the: 1. 2. Now for mass: 1. 2. As for the energy gained: 1. 2. Now for the energy of the reaction: 1. It is multiplied by an integer (-1)

  2. The chemistry of atmospheric and water pollution.

    Thus organisms dependant on plankton (food chain) will also die. These problems all originate from the emission of CFCs into the stratosphere. Steps taken to reduce problems associated with CFCs The international community has gradually begun to realise the damaging effects of CFCs on ozone. To combat the devastating effects of CFCs, many international agreements and treaties have been proposed.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work