Free Ideal Gas Equation MCQs with Answers
94 Ideal Gas Equation MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The ideal gas equation, PV = nRT, relates pressure, volume, amount and absolute temperature when gas particles are assumed to have negligible volume and no intermolecular forces. Applications include finding molar mass, density or an unknown gas variable, with careful use of Kelvin temperature and consistent units, and comparison with real-gas behaviour.
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94 questions Β· page 5 of 5
- A. 8.314 J/mol x K
- B. 1.38 x 10^-23 J/K
- C. 6.63 x 10^-11 Nm2/kg2
- D. 1.6 x 10^-19 C
Explanation: The dimensions of the universal gas constant R are energy per degree per mole.
Correct answer: 8.314 J/mol x K- A. 6 atm
- B. 4 atm
- C. 2 atm
- D. 1 atm
Explanation: Use the combined gas law.PβVβ/Tβ = PβVβ/TβPβ = initial pressure = 3 atmVβ = initial volume = 100 mΒ³Tβ = initial temperature= 27Β° C+273.15β¦
Correct answer: 2 atm- A. Dalton's Law
- B. Charles's Law
- C. Boyle's Law
- D. Graham's Law
Explanation: Explanation:Dalton's law states that the total pressure exerted by a mixture of non reacting gases is equal to the sum of their individualβ¦
Correct answer: Dalton's Law- A. 8.314 Jmol-2K-1
- B. 1.38 Jmol-1 K-2
- C. 1.38 Jmol-1K-1
- D. 8.314 Jmol-1 K-1
Explanation: Explanation: The value of the universal gas constant R depends on the units of pressure, volume, and temperature used.
Correct answer: 8.314 Jmol-1 K-1- A. 67.8 x100 / 50
- B. 50 x 100 / 100
- C. 67.8 X 50/ 100
- D. 67.8 +50/ 100
Explanation: To find the partial pressure of H2, we need to calculate the pressure contributed by H2 gas based on its percentage in the mixture.
Correct answer: 67.8 X 50/ 100- A. qV=nRt
- B. pV=nRt
- C. gV=nRt
- D. yV=nRt
Explanation: PV=nRTP = Pressure of the gasV = Volume of the gasn = Number of moles of gasR = Universal gas constant (8.314 J/molΒ·K)T = Temperature inβ¦
Correct answer: pV=nRt87. A mixture of 50gH2 and 50gHe has a total pressure of 1.5atm. What is the partial pressure of H2 gas?
- A. 1.0 atm
- B. 2.0 atm
- C. 1.5 atm
- D. 3.0 atm
Explanation: Partial Pressure = Mole Fraction x Total Pressure Find moles of hydrogen and helium; moles = mass/Mr; moles = 50/2 = 25 moles of hydrogenβ¦
Correct answer: 1.0 atm- A. 1.0atm
- B. 2.0atm
- C. 1.5atm
- D. 3.0atm
Explanation: Find moles of hydrogen and helium; moles = mass/Mr; moles = 50/2 = 25 moles of hydrogen moles= 50/4 = 12.5 moles of helium Total moles =β¦
Correct answer: 1.0atm89. If the pressure and temperature (k) of two liters of CO2 are doubled the volume of CO2 would become:
- A. 5 liters
- B. 4 liters
- C. 8 liters
- D. 2 liters
Explanation: As PV=nRT or V =nRT/PUsing P'=2P and T'=2T, we getV'= 2nRT/2PV'= nRT/PV'= VSo , the volume will be 2 litres.
Correct answer: 2 liters- A. The number of molecules in the gas
- B. Avogadro's number
- C. The number of kilo-moles
- D. The number of molecules per unit volume
Explanation: The ideal gas law can be written in terms of the number of molecules of gas: PV = nRT, where P is pressure, V is volume, T is temperatureβ¦
Correct answer: The number of molecules in the gas- A. (298)(750)(50)/(40)(765)
- B. (298)(750)(40)/(50)(765)
- C. (298)(765)(50)/(750)(40)
- D. (40)(750)/(298)(50)(765)
Explanation: PV=nRTAccording to the ideal gas equation: PV = nRT. P1V1/T1=P2V2/T2 OrT2=P2V2T1/ P1V1 So T2 Should be solved as follows T2β¦
Correct answer: (298)(765)(50)/(750)(40)- A. Avogadro constant; Boltzmann constant
- B. Avogadro constant; Molar gas constant
- C. Total number of molecules; Boltzmann constant
- D. Total number of molecules; Avogadro constant
Explanation: In the ideal gas equation pV = NkT, 'N' represents the total number of molecules of gas, while 'k' represents the Boltzmann constant.
Correct answer: Total number of molecules; Boltzmann constant- A. 10 atm, 25 atm, 15 atm
- B. 10 atm, 15 atm, 25 atm
- C. 25atm, 10 atm, 15 atm
- D. 15 atm, 25 atm, 10 atm
Explanation: Simplify 20:30:50 to get 10:15:25To find the partial pressures of each gas, we need to calculate the pressure contributed by each gasβ¦
Correct answer: 10 atm, 15 atm, 25 atm- A. Pπ = ππ T
- B. ππ = ππ T
- C. πππ = ππ T
- D. All of the above
Explanation: The correct equation to describe the behavior of ideal gases under standard conditions is PV = nRT.
Correct answer: Pπ = ππ T