Exam page 3 answer the following two questions a paper chromatography experiment was conducted on a mixture of amino acids including aspartic acid (asp), glutamic acid (glu), histidine (his), leucine (leu), phenylalanine (phe) and proline (pro). the following rf values were determined: asp (0.245), glutamic (0.275), his (0.295), leu (0.745), phe (0.685) and pro (0.445). in the experiment, a colored spot for unknown amino acid "x" was found centered at a distance 61 mm from the start line when the solvent line had travelled 82 mm. (1) show the calculation for the rf value for amino acid "x" and (2) identity amino acid "x". 61mm/82mm=.744, this corresponds to leu 0.745 2.) it is ba(hso4)2 , h cannot be detected which of the following is the formula of unknown #1 which gives the following sem spectrum. explain your answer. bs2o3 so3br ba(hso4)2

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a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o

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