CHEM 103 Module 2 Exam Questions and Answers | Portage Learning ()
1.18 moles of C9H8NO4Cl Grams = 1.18 moles X 229.614 = 270.944 grams --> 270.9 grams of C H NO Cl C = 9 x 12.01 = 108.09 H = 8 x 1.008 = 8.064 N = 1 x 14.01 = 14.01 O = 4 x 16.00 = 64 Cl = 1 x 35.45 = 35.45 Molecular Weight of C H NO Cl = 229.614 3 4 2 9 8 4 9 8 4 1. Grams = Moles x molecular weight = 1.05 x 310.18 = 325.7 grams 2. Grams = Moles x molecular weight = 1.18 x 229.61 = 270.9 grams Question 4 10 / 10 pts You may find the following resources helpful: Scientific Calculator ( Periodic Table M2: Exam - Requires Respondus LockDown Browser + Webcam: General Chemistry I w/Lab-2021- Kozminski 7/18 Your Answer: ( Equation Table ( download_frd=1) Show the calculation of the percent of each element present in the following compounds. Report your answer to 2 places after the decimal. 1. Ca (PO ) 2. C H NO Cl 3 4 2 9 8 4 1. Ca (PO ) Ca = 3 x 40.08 = 120.24 / 310.18 (x100) = 38.76% Ca P = 2 x 30.97 = 61.94 / 310.18 (x100) = 19.97% P O = 8 x 16.00 = 128 / 310.18 (x100) = 41.27% O 2. C H NO Cl C = 9 x 12.01 = 108.09 /229.614 (x100) = 47.07% C H = 8 x 1.008 = 8.064 /229.614 (x100) = 3.51% H N = 1 x 14.01 = 14.01 /229.614 (x100) = 6.10% N O = 4 x 16 = 64 /229.614 (x100) = 27.87% O Cl = 1 x 35.45 = 35.45 /229.614 (x100) = 15.44% Cl 3 4 2 9 8 4 M2: Exam - Requires Respondus LockDown Browser + Webcam: General Chemistry I w/Lab-2021- Kozminski 8/18 1. %Ca = 3 x 40.08/310.18 x 100 = 38.76% %P = 2 x 30.97/310.18 x 100 = 19.97% %O = 8 x 16.00/310.18 x 100 = 41.27% 2. %C = 9 x 12.01/229.61 x 100 = 47.08% %H = 8 x 1.008/229.61 x 100 = 3.51% %N = 1 x 14.01/229.61 x 100 = 6.10% %O = 4 x 16.00/229.61 x 100 = 27.86 %Cl = 1 x 35.45/229.61 x 100 = 15.44% Question 5 10 / 10 pts Your Answer: You may find the following resources helpful: Scientific Calculator ( Periodic Table ( Equation Table ( download_frd=1) Show the calculation of the empirical formula for each compound whose elemental composition is shown below. 38.76% Ca, 19.87% P, 41.27% O 38.76% Ca, 19.87% P, 41.27% O
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chem 103 module 2
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chem 103 module 2 exam questions and answers
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