Chemistry_1031_day12_021609

Chemistry_1031_day12_021609 - General Chemistry I CHE-1031...

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Unformatted text preview: General Chemistry I CHE-1031 Dr. Jonathan M. Smith Monday, February 16 Today Chemical Equations atomic mass Formula mass, Molecular mass Mole Stoichiometry Re-read Ch. 4 section 1-3 In class exam Friday, Feb. 20 ubber. elf-Healing Rubber Bounces Back from BBC News Online material that is able to self-repair even when it is sliced in two has been invented by French researchers. The as-yet-unnamed material - a form of artificial rubber - is made from vegetable oil nd a component of urine. he substance, described in the journal Nature, produces surfaces when cut that retain a strong hemical attraction to each other. Pieces of the material join together again as if never parted ithout the need for glue or a special treatment. his remarkable property comes from careful engineering of the molecules in the material. The rench researchers are already making kilogramme quantities in their Paris laboratories and say the process is almost completely green, and could be completely so with a few adjustments. o read more: http://news.bbc.co.uk/2/hi/science/nature/7254939.stm Chemical Equations Chapter 4 cid rain arises from sulfur in coal which when burned orms SO 2 If sulfur is 0.1% by weight of a certain coal and it requires 0.36 kg f coal for 1 kilowatt hour of electricity, how many kg of the strong cid H 2 SO 4 are produced in making that 1 kilowatt hour? Solution verage person (US) uses 12,000 Watt continuously, 12 kilowatt in an hour (combined energy usage) 0.36 kg x 0.001 = 3.6 x 10-4 kg S 3.6 x 10-4 kg S x 1 mole S /32.07 g = 1.12 x 10-5 mole S 1.12 x 10-5 mole S = 1.12 x 10-5 mole SO 2 1.12 x 10-5 mole SO 2 = 1.12 x 10-5 mole H 2 SO 4 1.12 x 10-5 mole H 2 SO 4 x 98.09 g H 2 SO 4 /mole = 1.10 g H 2 SO 4 Energy 1 Watt = 1 Joule/second [rate] kw = 1 x 10 3 Watt Kilowatt hour = 1000 Watt for 1 hour 1 kwh = 3600 k J Cost 1 kwh electricity ~ $0.07 Sulfurs role in acid rain Sulfur is limiting reactant (O 2 is abundant) S( s ) + O 2 ( g ) SO 2 ( g ) 2 SO 2 ( g ) + O 2 ( g ) 2 SO 3 ( g ) Once in the air, the SO 2 can react with oxygen molecules to form sulfur trioxide, which acts in the formation of aerosols....
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Chemistry_1031_day12_021609 - General Chemistry I CHE-1031...

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