2095-Exam1-Worked (1)

2095-Exam1-Worked (1) - Exam 1 Answer Sheet 1. PV=nRT...

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Exam 1 Answer Sheet 1. PV=nRT V=(nRT)/P 26.4 g O 2 x (1mol/32g O 2 ) = 0.825 mol O 2 = n R = 0.08206 L atm/mol K T = 273.15 K P = 1 atm V O2 = (0.825 mol O 2 x 0.08206 L atm/mol K x 273.15 K)/1 atm V O2 = 18.5 L 2V O2 = V CO2 = 37.0 L n CO2 = PV/RT = (1 atm x 37.0 L)/(0.08206 L atm/mol K x 273.15K) n CO2 = 1.65 mol CO 2 x (44g/mol) = 72.6 g CO 2 2. Ba(NO 3 ) 2 0.450M V = ? NO 3 - 0.272M V = 261.0 mL 0.450M Ba(NO 3 ) 2 x (2 mol NO 3 /1 mol Ba(NO 3 ) 2 ) = 0.900 M NO 3 M 1 V 1 = M 2 V 2 (0.9M)V 1 = (0.272M)(261.0mL) V 1 = 78.9 mL 3. 112 In x 115 In 1-x 114.8g = 112x + 115(1-x) 114.8g = 112x + 115 – 115x -0.2g = -3x x = 0.06 x 100% = 6% 1-0.06 = 0.94 x 100% = 94% 4. NaCl – 4.0 M; 0.04L CaCl 2 – 5.0M; 0.02L M x L = mol 4M x 0.04L = 0.16 mol NaCl x (1 mol Cl/1 mol NaCl) = 0.16 mol Cl 5 M x 0.02 L = 0.1 mol Ca Cl 2 x (2 mol Cl/1 mol CaCl 2 ) = 0.2 mol Cl (0.16 mol + 0.2 mol)/(0.04 L + 0.02 L) = 6 M Cl 5. C 6. B
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7. NaBrO x 52.95% Br 52.95 g Br (assume 100g sample) 47.05% Na + O
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2095-Exam1-Worked (1) - Exam 1 Answer Sheet 1. PV=nRT...

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