CHEM 123 Quiz 2 Q3

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University of Illinois, Chicago *

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123

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Chemistry

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Dec 6, 2023

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CHEM 123 Foundations of Chem Inquiry I (39654) 2022 Fall Answers: All Answer Choices Use the drop down menu to indicate the number of waters present in a hydrate of Fe(NO 3 ) 3 if it is found that a sample that contains 0.0423 moles of anhydrous Fe(NO 3 ) 3 and 0.250 moles of water. 6 1 2 3 4 5 6 7 8 Question 3 Selected Answer: Answers: In an experiment to determine the number of moles of water in a hydrate, 0.492 g of a hydrate of a sodium salt was found to have 0.158 g of the anhydrous cobalt salt. How many moles of water are in the original sample? For the molar mass of water, use the value 17.0153 g mol -1 . 0.0196 moles H 2 O 0.0185 moles H 2 O 0.0196 moles H 2 O 0.00870 moles H 2 O 0.0202 moles H 2 O Question 4 The image shows a calibration curve such as that collected for the "Spectrophotometric Analysis of a Hydrate" experiment. If an unknown solution is test and found to have A = 0.71, then what is the concentration of Cu 2+ , in moles per liter? Your answer should have two significant figures. 3 out of 3 points 4 out of 4 points ×
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