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Even More Gas_Problems_1 - Some ballpoint pens have a small...

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Some ballpoint pens have a small hole in the main body of the pen. What is the purpose of this hole?
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The empirical formula of a compound is CH. At 200ºC, 0.145 g of this compound occupies 97.2 mL at a pressure of 0.74 atm. What is the molecular formula of the compound?
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A certain hydrate has the formula MgSO 4 x H 2 O. A quantity of 54.2 g of the compound is heated in an oven to drive off the water. If the steam generated exerts a pressure of 24.8 atm in a 2.00-L container at 120ºC, calculate x .
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Interstellar space contains mostly hydrogen atoms at a concentration of about 1 atom/cm 3 . a) calculate the pressure of the H atoms in interstellar space b) calculate the volume (in L) that contains 1.0 g of H atoms in interstellar space (the temperature is 3 K)
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A barometer having a cross-sectional area of 1.00 cm 2 at sea level measures a pressure of 76.0 cm of mercury. The pressure exerted by this column of mercury is equal to the pressure exerted by all the air on 1 cm 3 of Earth’s surface. Given that the density of mercury is 13.6 g/mL and the average radius of Earth is
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