Chemistry please help :)
posted by Jackie .
A 1.10 sample of dry ice is added to a 745 mL flask containing nitrogen gas at a temperature of 25.0 degrees C and a pressure of 735 mm Hg . The dry ice is allowed to sublime (convert from solid to gas) and the mixture is allowed to return to 25.0 degrees C.
What is the total pressure of the flask?
Any help would be greatly appreciated.

How many moles N2 do you have initially? That will be n = PV/RT.
Then you will add how many moles CO2? That will be moles = grams/molar mass.
Then rework PV = nRT with total moles and solve for total P.