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3.2 Use of amount of substance in relation to masses of pure substances

3.2 Use of amount of substance in relation to masses of pure substances

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Question 7

Phosphine, PH3\text{PH}_3PH3​, is a highly toxic hydride of phosphorus. It burns in excess oxygen to produce solid tetraphosphorus decaoxide and water vapour.

The equation for the reaction is:

4PH3(g)+8O2(g)→P4O10(s)+6H2O(g) 4\text{PH}_3(\text{g}) + 8\text{O}_2(\text{g}) \rightarrow \text{P}_4\text{O}_{10}(\text{s}) + 6\text{H}_2\text{O}(\text{g}) 4PH3​(g)+8O2​(g)→P4​O10​(s)+6H2​O(g)

80 cm380\text{ cm}^380 cm3 of PH3\text{PH}_3PH3​ is reacted with 210 cm3210\text{ cm}^3210 cm3 of oxygen.

Calculate the total volume of gases present after the reaction is complete.

All volumes of gases are measured at the same temperature and pressure. Assume the temperature is high enough that water remains in the gas phase.

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Markscheme

3.2 Use of amount of substance in relation to masses of pure substances Questions

  1. GCSE
  2. /Chemistry
  3. /3.2 Use of amount of substance in relation to masses of pure substances

38 exam-style questions on AQA GCSE Chemistry 3.2 Use of amount of substance in relation to masses of pure substances, covering 3.2.1 Moles (HT only), 3.2.2 Amounts of substances in equations (HT only), 3.2.3 Using moles to balance equations (HT only), 3.2.4 Limiting reactants (HT only), and 3.2.5 Concentration of solutions. Each one has a worked solution and a mark scheme showing where the marks go.

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