Dry ice (solid CO2 ) has occasionally been used as an "explosive" in mining.

Dry ice (solid CO2 ) has occasionally been used as an "explosive" in mining. A hole is drilled, dry ice and a small amount of gunpowder are placed in the hole, a fuse is added, and the hole is plugged. When lit, the exploding gunpowder rapidly vaporizes the dry ice, building up an immense pressure. Assume that 493g of dry ice is placed in a cavity with a volume of 0.710 L and the ignited gunpowder heats the CO2 to 710°C.What is the final pressure inside the hole?