To determine the molecular weight of a liquid compound,1.56 grams of the compound is vaporized in a 0.555L container at 30ºC and the pressure is measured as 1.2 atm. What is the molecular weight of the compound?
PV=nRT
Since your volume and pressure are provided in L and atm, respectively, you can use the version of the gas law constant that has these units:
R= 0.082057 L*atm/(K*mol)
Now convert temperature from deg C to deg K:
T=273 K + 30 C = _____K
Substitute P, V, R, and T into the equation and solve for n.
n has units of mol, so now take the given mass and divide by n, to get molecular weight (g/mol).