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1. You are given a quantity of a volatile liquid substance and asked to determine its...

1. You are given a quantity of a volatile liquid substance and asked to determine its molecular weight. To do that, you place a sample of the liquid in a 200.0-mL flask and submerge the flask in a boiling water to vaporize all of the liquid. The vapor fills the flask and the excess escapes,. Now you cool the flask so that all the vapor in it condenses, and you weigh the flask and liquid. After you subtract the mass of the flask, you find that the mass of the substance in the flask is 0.970 g. The temperature of the boiling water was 99 degrees C; the barometric pressures 733 mmHg. What is the molecular weight of the substance in amu?

2. How many grams of oxygen, O2, are there in a 50.0-L tank at 21 degrees C when the oxygen pressure is 15.7 atm?

3. What is the density of oxygen, O2, in grams per liter at 25 degrees C and 0.850 atm?

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