Posted by Ginger on .
If the molar mass of monatomic deuterium (D) is 2.0141 g, then what is the density of diatomic deuterium (D2) gas at 25.0°C and 1.00 atm?
I know the equation for density is: d=m/v
What equation(s) do I need to use to solve this?

Chem 
DrBob222,
1 mol of D has a mass of 2.0141 grams and occupies a volume of 22.414 L at STP (1 atm and 273 K). Use PV = nRT to calculate standard volume at 298 K, then use m/v to calculate density.