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

    hence, the volume remains constant here. Thus, the only way a drop of a substance (of the same volume as the other three drops) will have more number of molecules than any other will be by the liquid having a lower RMM, so that more number of particles would fit in that drop.

  2. Indicator Lab Report - investigating acid-base reactions

    Another area for improvement would be the amount of alkali added in the strong acid and weak base titration. By adding more alkali, the equivalence point could be determined and, by doing so, the buffer region and 1/2 equivalence point could also be determined.

  1. Change of Potential Difference in Voltaic Cells Lab Report

    Avoid contact with skin and eyes. Keep away from incompatibles such as metals, alkalis. Personal Protection: Wear safety goggles, lab coat and latex gloves. Waste Disposal: Copper sulfate is poisonous and harmful to the environment; it should be disposed in the waste container not in the bin or the sink.

  2. IB Chemistry - Boyle's Law Lab Report

    According to the Boyles' law, Pressure*Volume has constancy because pressure and volume are inversely related to each other. To find out the pressure, I had to fine out the mass and the area of contact because the pressure has a formula (Mass/Area).

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

    Average volume of HCl required to neutralize 25.0cm3 of the X2CO3 solution (cm3) Molecular Mass of X2CO3 derived (g.mol-1) Atomic Mass of X derived (g.mol-1) 0.15 28.0 107.1 23.56 0.20 37.1 108.1 24.05 0.25 47.2 105.9 22.95 Table 3: Atomic mass of X derived from the three trials of each sample.

  1. The chemistry of atmospheric and water pollution.

    These provide a surface to act as a catalyst. Ozone depletion by halons Process is very similar to CFCs: Once the halon has entered stratosphere, the UV radiation from the sun is absorbed by the halon causing it to photo dissociate.

  2. Chemistry thermo lab, Hess's Law.

    3. Now, we can use q=mc ?T to calculate the energy gained by the solution: 1. 2. Therefore: 1. Now, we have to calculate the number of moles for MgO: 1. 2. We can now calculate the change in enthalpy by dividing the q of the reaction by the moles of the limiting reagent: 1.

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