"tumbaga was the name given by spaniards to a non-specific alloy of gold and copper, which they found in widespread use in pre-columbian mesoamerica and south america. the proportion of gold to copper in artifacts varies widely; items have been found with as much as 97% gold while others instead contain 97% copper (text from wikipedia). a 5.65 g sample of tumbaga was submitted for analysis. you put the sample into concentrated nitric acid, where the copper (but not the gold) reacts with nitric acid via an oxidation-reduction reaction to produce no2, a poisonous brown gas and h2o. the no2 is collected at 25 ° c over water (remember what gas ""collected over water"" means). the collected gas occupies 676.5 ml at a total pressure of 793 mm hg. calculate the percent copper (by mass) in the sample. (assume that all of the copper in the sample dissolves.) submit your answer as a video in which you show your work for solving the problem and describe your process for solving the problem (similar to previous recitation videos) 1 cu(s)+ 4 hno 3(aq) ? 2 no 2(g) + cu(no 3) 2(aq) + 2 h 2o(l)" Get the answer
Category: business | Author: Mona Eva