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Unformatted text preview: Girish Toofany- Chem121/120 2008-3 Surrey Le 1 Assignment 2. Due date: Sat Sep 20 23:59:00 2008 1 point(s) Reaction Stoichiometry Most hydrocarbons are highly combustible. That is, they can react spontaneously with oxygen (O 2 ), forming the products carbon dioxide, (CO 2 ), and water, (H 2 O). What mass of carbon dioxide will be produced by the com- plete combustion of 2.75 g of methyl butane (CH 3 C 4 H 9 )? You are correct. Your receipt is 167-489 2 point(s) Reaction Yield (2 parts) Organotin compounds play a significant role in diverse indus- trial applications. They have been used as plastic stabilizers and as pesticides or fungicides. One method used to prepare simple tetraalkylstannanes is the controlled direct reaction of liquid tin(IV) chloride with highly reactive trialkylaluminum compounds, such as liquid triethylaluminum (Al(C 2 H 5 ) 3 ). 3SnCl 4 + 4Al(C 2 H 5 ) 3- 3Sn(C 2 H 5 ) 4 + 4AlCl 3 In one experiment, 0.260 L of SnCl 4 (d = 2.226 g/mL) was treated with 0.517 L of triethylaluminum (Al(C 2 H 5 ) 3 ); d = 0.835 g/mL). What is the theoretical yield in this experiment ( mass of tetraethylstannane, Sn(C 2 H 5 ) 4 )? You are correct. Your receipt is 167-2215 If 0.325 L of tetraethylstannane (d = 1.187 g/mL) were actu- ally isolated in this experiment, what was the percent yield? % You are correct. Your receipt is 167-7294 2 point(s) Stoichiometry and Volumetric Analysis A piece of chalk (mainly calcium carbonate) is placed in 250. mL of 0.398 M HCl. All the CaCO 3 reacts, releasing carbon dioxide gas, and leav- ing a clear solution. 45.00 mL of the solution is pipetted into another flask....
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