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IB Chemistry HL 1.4.6 Avogadros Law Questions

Relate equal gas volumes at the same temperature and pressure to equal amounts, then use balanced-equation volume ratios and molar volume at STP/SATP.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • Relate equal volumes of gases at the same temperature and pressure to equal amounts and numbers of molecules.
  • Use balanced-equation gas-volume ratios to calculate reactant or product gas volumes and identify limiting gas quantities.
  • Convert between gas amount and volume using molar volume at STP or SATP, with consistent units and significant figures.

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Study 1.4.6—Avogadro's law conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry HL 1.4.6 Avogadros Law Questions question 1

[Maximum number: 1]

Phosphine (IUPAC name phosphane) is a hydride of phosphorus, with the formula PH3\mathrm{PH}_{3}.

2.478 g of white phosphorus was used to make phosphine according to the equation:

P4( s)+3OH−(aq)+3H2O(l)→PH3( g)+3H2PO2−(aq)\mathrm{P}_{4}(\mathrm{~s})+3 \mathrm{OH}^{-}(\mathrm{aq})+3 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow \mathrm{PH}_{3}(\mathrm{~g})+3 \mathrm{H}_{2} \mathrm{PO}_{2}^{-}(\mathrm{aq})

Determine the volume of phosphine, measured in cm3\mathrm{cm}^{3} at standard temperature and pressure, that was produced.

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