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

EasyMediumHard
123456789101112131415161718192021222324252627282930313233
Question 9
Medium

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.

[4]

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

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