Make weighings to the nearest 0. There are really several gases mixed together in lighter fluid. For example, the symbol for iron is Fe, which is based on the Latin ferrum. The largest error in this experiment is in determining the mass of the lighter. For instance, an element with an atomic mass of 1 hydrogen has one particle within it's nucleus. The lighter is weighed both before and after the gas is withdrawn. Atomic mass is approximately the mass of all protons, neutrons and electrons in one atom added together.
The goal of the lab was to determine the molar mass and the plausible formula of the chemical, using a glass bottle, a lighter, and a handful of laboratory equipments. Cover the cylinder with plastic wrap. When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. Higher, lower, no effect Explain Why!! Octane is relatively large, and has a molecular mass of approximately 114 grams per moles. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes.
The molar masses of the gasses for three trials were 64. The box was filled with water. Examples of molecular weight computations: ,. Only emails and answers are saved in our archive. The mass of the lighter would have been bigger than the actual mass.
The atomic mass of hydrogen, represented by the chemical symbol H, is about 1 gram per mole, for a total of 6 grams per mole of hydrogen in ethane. Precautions Remove flames or other ignition sources from the laboratory. The mL was converted to L. And so you can see that it depends on the composition of the things you are comparing. Background: The purpose of this lab is to find the molar mass of mixed gases in a lighter, and to calculate… 1777 Words 8 Pages Modern life has become accustomed to the use and influence of mass communication.
Although the atomic masses of nickel and cobalt are very close, these are the isotopic abundances of nickel. The exception is hydrogen which has only one proton and one electron. Bawsed on your results, do the other gases have a higher or lower molar mass than butane? You forgot to correct the pressure for the vapor pressure of water. These relative weights computed from the chemical equation are sometimes called equation weights. In this way, butane leaks can easily be identified. Times the approximate 5 million in Canada every day say we have a problem Small solution!!! A mole is a unit of matter that represents a known number of particles that is large enough to be weighed on a laboratory balance.
On the other hand, hydrogen gas H 2 has a molar mass of 2 grams per mole, and chlorine gas Cl 2 has a molar mass of 71 grams per mole, and Cl 2 is indeed much larger than H 2. That's why the atomic mass numberis sometimes not a whole number but a decimal number as in oxygenbeing 15. Atoms are matter, and all matter has mass. The air bubble would have mixed in with the gas, changing the result of the lab. Teachers Guide Purpose To determine the molar mass of the butane in a disposable cigarette lighter. Hydrogen bonding can occur between ethanol molecules, although not as effectively as in water.
Each element has a unique number of protons. Carry a magnifying glass, a 9 volt battery with steel wool and tweezers When the sun is out we can use our magnifying glass to light our smoking products and on the days that the sun is in take a little bit of steel wool fine roll it up in your fingers to a little ball just big enough to touch the two prongs on the 9 volt battery. Please read for more information about how you can control adserving and the information collected. To complete this calculation, you have to know what substance you are trying to convert. The pressure, volume, and temperature of the gas was calculated to be 0.
The lighter was also submerged in the water and its gas was released. Make sure… 1676 Words 7 Pages The Ka and Molar Mass of a Monoprotic Weak Acid Chemistry Lab 152 Professor: James Giles November 7, 2012 Abstract: The purpose of this experiment was to determine the pKa, Ka, and molar mass of an unknown acid 14. However, the amount of water stuck to the lighter would have been insignificant and probably would not have impacted the overall result much. You forgot to change Celsius temperature to Kelvin for your calculations. Nickel-58 is the most abundant isotope, so it is expected that the average atomic mass of nickel is closest to the mass of nickel-58. Most elements occur naturally as a mix of different isotopes.
Collect several hundred cubic centimeters or mL of gas. Type in your own numbers in the form to convert the units! The gas is an alkane contains only carbon and hydrogen with single bonds. The atomic mass of an element is approximately the mass of each proton, neutron and electron added together. Helium, for example has an atomic number of 2, indicating that it has 2 protons. Formula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction.