According to Avogadro's law, equal volumes of gases at STP contain:

Answer: Equal numbers of moles (and molecules) Avogadro: at the same T and P, equal volumes contain equal numbers of particles. At STP, 22.4 L = 1 mol.

Answer: PV = nRT n = moles, R = 0.0821 L·atm/(mol·K) = 8.314 J/(mol·K), T in Kelvin.

The straight line through the origin describes:

Answer: V proportional to T at constant P (Charles's Law) A direct proportional plot of V vs T (in kelvin) extrapolating through the origin demonstrates Charles's Law.

AP Chemistry · Topic 3.4

Ideal Gas Law Practice

Part of Properties of Substances and Mixtures.(SAP-7.B)

Practice questions

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Sample questions

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Sample 1difficulty 1/5
$Two identical 22.4 L containers at STP hold N2 in one and He in the other.$
$According to Avogadro's law, equal volumes of gases at STP contain:$
- A
  $Equal masses$
- B
  $Equal densities$
- C
  $Equal energies$
- D
  $Equal numbers of moles (and molecules)$
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Why
$Avogadro: at the same T and P, equal volumes contain equal numbers of particles. At STP, 22.4 L = 1 mol.$
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Sample 2difficulty 1/5
$The ideal gas law is$
- A
  $PV = nRT$
  check_circle
- B
  $P/V = nT$
- C
  $PV = mRT$
- D
  $P = nRT$
Why
$n = moles, R = 0.0821 L\cdotatm/(mol\cdotK) = 8.314 J/(mol\cdotK), T in Kelvin.$
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Sample 3difficulty 1/5
$The straight line through the origin describes:$
- A
  $V proportional to 1/T$
- B
  $P proportional to T$
- C
  $V proportional to T at constant P (Charles's Law)$
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- D
  $Boyle's Law$
Why
$A direct proportional plot of V vs T (in kelvin) extrapolating through the origin demonstrates Charles's Law.$
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Sample 4difficulty 1/5
$The total pressure in the container is:$
- A
  $1.0 atm$
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- B
  $0.4 atm$
- C
  $0.6 atm$
- D
  $0.24 atm$
Why
$Dalton's law: P_total = sum of partial pressures = 0.6 + 0.4 = 1.0 atm.$
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Sample 5difficulty 1/5
$A fixed amount of an ideal gas is held at constant temperature.$
$The hyperbolic curve of P vs V at constant T illustrates which relationship?$
- A
  $PV = nT$
- B
  $P and V are inversely proportional (Boyle's Law)$
  check_circle
- C
  $P and V are directly proportional$
- D
  $Charles's Law$
Why
$At constant n and T, PV = constant; this hyperbolic shape is the signature of Boyle's Law (P proportional to 1/V).$
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