# A samle of a volatile liquid is vaporized completely in a 24 cm cubed flask at 135 degrees celcuis and 1200 mm

a samle of a volatile liquid is vaporized completely in a 24 cm cubed flask at 135 degrees celcuis and 1200 mm Hg. the condensed vapor(liquid) weighs 0.837 grams. what is the molecular weight? the liquid contains 64.9%carbon,13.5%hydrogen, and 21.7% oxygen. What is the molecular formula?

V = 24 cc = 24 mL = 0.024 L

T = 135 + 273 = 408 K

p = 1200 / 760 = 1.58 atm

n = pV / RT = 1.58 x 0.024 / 0.0821 x 408 = 0.00113 moles

0.837 / 0.00113 = 739 g/mol

64.9 / 12= 5.78

13.5 / 1 = 13.5

21.7/ 16 = 1.36

we divide for the smallest number

C4H10Cl ( mass = 93 g/mol )

739 / 93 = 8

The molecular formula is C32H80Cl8

use pv = nrt to find moles of the liquid. Make sure pressure is in atm volume is liters r = 0.0821 and T is kelvin.

Then use grams/moles to get the molar mass. Once you have the molar mass use the percentages to figure out how many grams of each atom you have... then convert to figure out how many moles of each atom you have. These values will be the subscripts in the molecular formula

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**Answer:**V = 24 cc = 24 mL = 0.024 L

T = 135 + 273 = 408 K

p = 1200 / 760 = 1.58 atm

n = pV / RT = 1.58 x 0.024 / 0.0821 x 408 = 0.00113 moles

0.837 / 0.00113 = 739 g/mol

64.9 / 12= 5.78

13.5 / 1 = 13.5

21.7/ 16 = 1.36

we divide for the smallest number

C4H10Cl ( mass = 93 g/mol )

739 / 93 = 8

The molecular formula is C32H80Cl8

use pv = nrt to find moles of the liquid. Make sure pressure is in atm volume is liters r = 0.0821 and T is kelvin.

Then use grams/moles to get the molar mass. Once you have the molar mass use the percentages to figure out how many grams of each atom you have... then convert to figure out how many moles of each atom you have. These values will be the subscripts in the molecular formula

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