What volume of gas is produced by vaporizing a given volume of dry ice?

1. How many grams of CO₂ are in one cc of dry ice? The density of dry ice is about 1.5 g/mL, so 1 cc is about 1.5 g CO₂.
2. How many moles of CO₂ are in that number of grams? The molecular weight of CO₂ is about 44 g/mol, so 1.5 g is

   1.5 g CO2 ×

   (

   1 mol CO2 44 g CO2

   )

   = 0.034091 mol CO2

3. What volume of gas contains that many moles of gas? Assume that the gas behaves ideally. At room pressure (about 1 atm) and temperature (about 25°C, or 298 K),

   V = nRT/P
   V = (0.034 mol × 0.0821 L atm mol^-1 K^-1 × 298 K)/(1 atm)
   V = 8.3 × 10^-1 L

Author: Fred Senese senese@antoine.frostburg.edu