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# The molar mass of butane.

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Introduction

Eirik Hjerten�s 30.01.04 The molar mass of butane Introduction: The research question we worked with in this experiment was to try to calculate the molar mass of butane by use of the gas laws. Since the value it self is easily found by using the periodic table, we are doing this experiment mainly to see if it is possible for any gas to calculate the molar mass. We will try to reach the molar mass by calculations based on the gas laws and the fact that one mole of gas occupies 22.4 L at STP. Thus it is possible to calculate the molar mass by measuring the volume of a know mass of gas at known conditions. We know that the theoretical value of the molar mass of butane is 58, so if the experiment is carried out properly, we will get a value close to 58. ...read more.

Middle

Then we measured the pressure in the room and the temperature in the water. Then we dried the lighter with a blow dryer and measured the weight. Observations and calculations: Weight of lighter before: 24.660 g +/- 0.001 g Weight of lighter after: 24.430 g +/- 0.001 g Weight of gas released: * min: 24.659 g - 24.431 g = 0.228 g * max: 24.661 g - 24.429 g = 0.232 g * m : 24.660 g - 24.430 g = 0.230 g +/- 2 g Temperature: 22�C +/- 0.5� Pressure (in the air): 1014 mb +/- 1 mb= 101.4 kPa +/- 0.1 kPa Vapor pressure: 2.64 kPa (found in table and therefore no uncertainty) Partial pressure of the gas: 101.4 kPa - 2.64 kPa = 98.76 kPa Volume of gas released: Volume of air in the cylinder: 1.3 ml +/- 0.1 ml Volume of gas in the cylinder when releasing of gas was done: 100 ml +/- 0.1 ml Volume of butane ...read more.

Conclusion

It is perhaps not very useful to do this if the identity of the gas is know, but if we do not know what gas we are dealing with, this method could to certain extent be used to find out what gas it is. We can draw this conclusion because we found a value close, but not exactly, the literature value. When we performed this practical, we did everything according to the instructions, at least as far as I can remember. However, it was a quite complicated procedure with many things that had to be dealt with carefully and I do not think it impossible that we neglected some of this. The part where we should fill a graduated test tube to the top with water and turn it upside down in the tub with out letting any gas in, was a difficult maneuver. But all in all, the procedure was good, when performed properly. ...read more.

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