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)→P4O10(s)+6H2O(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.