11-GasLaws-Ans

# 11-GasLaws-Ans - DALTONS LAW MOLAR GAS VOLUME COMBINE GAS...

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DALTON’S LAW, MOLAR GAS VOLUME, COMBINE GAS LAW, and IDEAL GAS LAW GCHEM II LAB CONCEPT PROBLEMS DALTON’S LAW: P TOTAL = Pp GAS “A” + P p GAS” B” + . . . + Pp GAS”N” Pp GAS”N” = Mole Fraction GAS”N” * P TOTAL Mole Fraction GAS ”N” = Moles GAS ”N” / Total Moles ALL GASES 1. What is pressure (torr) of CO 2 collected over water at 25.50 o C and atmospheric pressure of 775.6 torr ? per vapor pressure H 2 O TABLE: at 25. 5 o C = 24. 471 torr Pressure Total = Pp H2O + Pp CO2 ; 775. 6 = 24. 471 + P CO2 ; P CO2 = 775. 6 – 24. 471 = 751.129; P CO2 = 751. 1 torr 2. Determine mole fraction of oxygen in an air sample made of 62.5% N 2 , 19.3% O 2 , and 18.2% CO 2 ? 62.5 grs N 2 moles N 2 = 2.231; 19.3 grs O 2 moles O 2 = 0.6031; 18.2 grs CO 2 moles CO 2 = 0.4135 28.02 grs N 2 32.00 grs O 2 44.01 grs CO 2 Total Moles = 2.231 + 0.6031 + 0.4135 = 3.247; Mole Fraction O 2 = 0. 6031/3. 247 = 0.18574 X O2 = 0.186 3. A mixture of gases was collected at a chemical spill. The masses of the collected gases were as follows: NH 3 – 2.43 grams, CO 2 – 4.12 grams, H 2 S – 1.56 grams. The pressure gauge on gas collecting device read 4.55 atm. Which gas is most dangerous (gas that exerts greatest pressure on gas collecting device ) ? 2.43

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11-GasLaws-Ans - DALTONS LAW MOLAR GAS VOLUME COMBINE GAS...

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