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chemAssignment1

# chemAssignment1 - Premal Parekh 1 Assignment 1 1.30 a...

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Premal Parekh Assignment # 1 1 1.30 a) Density of benzene = 21.95 g/ 25.0 = 0.878 g/mL Yes calculated density is in agreement with the tabulated value b) Volume of cyclohexane = 15.0 g/ 0.7781 = 19.3 mL c) radius = 5.0/2 = 2.5 cm Volume of sphere = (4(pi)r^3) / 3 V = 4 x 3.14 ( 2.5 )^3/3 = 65.4 cm^3 Mass of lead = volume * density = 65.4 cm^3 x 11.34 g/cm^3= 741 g 1.71 - Total mass is 58.58, and the sample is 32.65g, then the mass of the toluene = 58.58g - 32.65g = 25.93g. - The density of toluene = 0.864g/ml, then the volume of the toluene = (Mass / Density) 25.93g x ml/0.864g = 30.01 ml - The volume of the sample is 50.00 ml - 30.01 ml = 19.98 ml - The density of the sample 32.65g/19.98ml = 1.63 g/ml 2.8 a) Sulphur that must be obtained is 6.500 g total – 0.384 g H2 = 6.116 g of sulfur b) This experiment demonstrates the fundamental law of conservation of mass Add more stuff c) Dalton's law says that when new compounds form as a result of a chemical reaction, it's just the atoms that have been rearranged. You still have the same proportion of atoms that you started out with 2.28 a) The mass in amu of carbon-12 atom is 12 amu b) The atomic weight given on the periodic table is the average weight of a sample of the element including it most common isotopes. Since the isotopes can have different weights, due to this average weights, the number is a little off .

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chemAssignment1 - Premal Parekh 1 Assignment 1 1.30 a...

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