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4) Air is about 80% nitrogen and 20% oxygen. What is the ratio of the weight of the helium balloon to the weight of the air-filled balloon? (Hint: Imagine that there are 80 helium atoms in the helium balloon. Calculate the mass, in atomic mass units, of this amount of helium, and then compare it to the mass of the corresponding number of oxygen and nitrogen molecules.)

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4) Air is about 80% nitrogen and 20% oxygen. What is the ratio of the weight of the helium balloon to the weight of the air-filled balloon? (Hint: Imagine that there are 80 helium atoms in the helium balloon. Calculate the mass, in atomic mass units, of this amount of helium, and then compare it to the mass of the corresponding number of oxygen and nitrogen molecules.)

 
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