Module 7 Unit 1 Assignment C

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Fanshawe College *

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MI-JUN ACE

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Chemistry

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Jan 9, 2024

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MODULE 7 UNIT 1 Assignment Part C To receive full mark, show all calculations in each answer. 1. Solve the following problems: a) What is the molarity of a solution that contains 4.53 moles of lithium nitrate, LiNO 3 , in 2.85 liters of solution? M = 4.53 mol LiNO 3 / 2.85 L = 1.58 M b) What is the molarity of a solution containing 214.2 grams osmium (III) fluoride, OsF 3 , in 0.0673 liters of solution? 1 mol OsF 3 = 190.23g + (3 x 18.998g) = 247.224 g 214.7g x 1 mol / 247.224g = 0.86 mol OsF 3 0.86 mol OsF 3 / 0.0673 L = 12.7 M c) Calculate the molarity of 73.0 g of hydrochloric acid, HCl, in 2.00 L of an HCl solution. 1 mol HCl = 1.008g + 35.45g = 36.458g 73.0g x 1 mol / 36.458g = 2.0 mol HCl 2.0 mol HCl / 2.00 L = 1.0 M Total 6 marks 2. Calculate the mass required to prepare each of the following solutions: a) Calculate the mass of NaNO 3 needed to prepare 175 mL of 3.00 M solution. Mol = 3.00 M x 0.175 L = 0.525 mol NaNO 3 1 mol NaNO 3 = 22.990g + 14.007g + (3 x 16.00g) = 84.997g 0.525 mol NaNO 3 x 84.997g / 1 mol = 44.6 g NaNO 3 b) How many grams of amino acids are needed to prepare 250 mL of 4.0% solution? 4.0% = 4.0g / 100mL 250mL x 4.0g / 100mL = 10.0 g c) How many grams of salt is needed to prepare 200mL of a 7% salt in water solution? 1
7.0% = 7.0 g / 100 mL 200 mL x 7.0 g / 100 mL = 14 g Total 6 marks Submission Instructions Submit your assignment using the drop box on the Assignment page for this unit. Remember to include references. 2
References: Fanshawe College. (2023) “Module 7 Unit 1 Presentation” retrieved from https://olmoodle.ontariolearn.com/mod/scorm/player.php? a=8784¤torg=articulate_rise&scoid=17778&sesskey=oOC7l9mxpB& display=popup&mode=normal Ptable.com (2023) “periodic table” retrieved from https://ptable.com/image/periodic-table.svg 3
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