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10-GasLaws

# 10-GasLaws - GCHEM II LAB CONCEPT PROBLEMS DALTONS LAW...

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GCHEM II LAB CONCEPT PROBLEMS DALTON’S LAW, MOLAR VOLUME GAS, COMBINE GAS LAW, and IDEAL GAS LAW 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 ? 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 ? 3. A mixture of gases was collected at a chemical spill. The mass of collected gases were as follows: NH 3 – 2.43 grs, CO 2 – 4.12 grs, H 2 S – 1.56 grs. The pressure gauge on gas collecting device read 4.55 atm. Which gas is most dangerous and what is the partial pressure that it exerts on gas collecting device ? MOLAR VOLUME GASES at STP: 22.4 LITERS of any gas / MOLE of any gas 4. A flask with a volume of 285.5 cm 3 contains N 2 at STP, how many moles of nitrogen are in the flask ?

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