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IB Chemistry HL 1.4.3 Molar Mass Question Bank

Practise IB Chemistry HL 1.4.3 with SL and HL questions on molar mass, formulae, moles and mass conversions.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

1.4.3—Molar mass (M) 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})

Calculate the amount, in mol, of white phosphorus used.

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