28-Molarity-molality-Ans

28-Molarity-molality-Ans - = 2.288 x 10-4 2.28 x 10-4 3 S/F...

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GCHEM II MOLARTY & MOLALITY CONCEPT PROBLEMS 1) A beaker contains 21.5 cm 3 of dilute sodium chloride solution. How many mls of sodium chloride solution are in the beaker ? cm 3 H 2 O = 1mls H 2 O at 4 o C 3s/f 21.5 mls H 2 O 2) What is the mass of 456.3 ml of H 2 O at 18.4 o C ? 28.4 o C H 2 O density 0.99626 grams H 2 O 456.3 mls H 2 O = 454.593 4s/f 454.6 grams H 2 O 1 ml H 2 O 3) Water in a flask at 24.7 o C has a mass of 212.4 grams. What volume of water is in the flask ? 24.7 o C H 2 O density 1 ml H 2 O 212.4 grs H 2 O = 213.006 4s/f 213.0 mls H 2 O 0.997152 grs H 2 O 4) A solution was made in the lab with 34.5 grams of zinc chloride and 1,104.5 grams of water at 17.5 o C. ZnCl 2 is an ionic or molecular compound (circle). Moles HCl = 34.5 grs ZnCl 2 */ 136.29 grs/mole = 0.2531 Liters H 2 O = 1104.5 / .998782 = 1,105.8 Molarity M = (0.2531)/ 1,105.8/
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Unformatted text preview: = 2.288 x 10-4 2.28 x 10-4 3 S/F molality ? (2) * 2.28 x 10-4 = 4.577 x 10-4 4.58 x 10-4 3 S/F 5) A solution was made in the lab with 45.3 mls of water at 25.8 o C and 4.89 grams of KI. KI is an ionic or molecular compound (circle) Molarity ? 4.89 grs KI KI moles KI = 0.0294 moles KI 66.00 grs KI molality 6) A solution was made with 62.0 mls of ethylene glycol (d =1.786 grams/ml) and 200.0 mls of water at 24.4 o C. Is ethylene glycol an ionic or molecular compound (circle). Molarity ? molality ? 7) A solution is made with 15.0% by mass ethanol (CH 3 OH) and 85.0% water (d = 1.452 grams/cm 3 and temperature 22.6 o C ). Ethanol is an ionic or molecular compound (circle) Molarity ? molality ?...
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This note was uploaded on 07/28/2011 for the course CHM 2046c taught by Professor Staff during the Summer '08 term at UNF.

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28-Molarity-molality-Ans - = 2.288 x 10-4 2.28 x 10-4 3 S/F...

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