A 3.26 gram sample of dry ice (CO2) was placed in a 2.00 L steel container and allowed to sublime. Calculate the number of moles of CO2?
Atomic weights: C=122, O=16, CO2=44 3.26gCO2(s) x 1molCO2/44gCO2 = 0.0741 mole CO2 to three significant figures. The 2.00 is a McGuffin: It is put in there to lead you astray.