An environmental scientist wants to prepare some standards to calibrate a portable gas chromatograph to be used to conduct a screening of volatile organic compounds extracted from a soil vapor extraction system. Assuming ideal gas behavior (1 mole of gas occupies a 22.4 L volume at STP), what volume of neat (pure) liquid would be needed to prepare a gas standard containing benzene (density = 0.877 g/mL) and tetrachloroethylene (density = 1.62 g/mL) to produce standard concentrations of 100uL/L (ppmv) and 500 uL/L respectively? The standard is prepared at STP and in a 1-L glass sampling bulb.
