A 5.00 mL sample of an unknown liquid is vaporized in a flask having a volume of 285 mL. At 100°C, 0.4168 g of?
A 5.00 mL sample of an unknown liquid is vaporized in a flask having a volume of 285 mL. At 100°C, 0.4168 g of the vapor exerts a pressure of 740 torr. Calculate the gram molar mass of the unknown liquid.
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PV=nRT
P=740 torr
V=0.285 L
n=# of moles (what you need for the next step)
R=62.36 (torr-L)/(K-mole)
T= 373K
Then, to find the g/mole (molar mass), it's 0.4168 g divided by your value of n.