Question

The molar mass of newly synthesized flourocarbon was measured in a gas microbalance. The device consists of a glass bulb forming one end of a beam, the whole surrounded by a closed container. The beam is pivoted, and the balance point is attained by raising the pressure of gas in the container, so increasing the buoyancy of the enclosed bulb. In one experiment, the balance point was reached when the fluorocarbon pressure was 327.10 torr; for the same setting of the pivot, a balance was reached when CHF3 (M=70.014g/mol) was introduced at 423.22 torr. A repeat of the experiment with different setting of the pivot required a pressure of of 293.22 torr of the fluorocarbon and 427.22 torr of the CHF3. What is the Molar mass of the fluorocarbon? Suggest a molecular formula.