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Hello.
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In this question, we are given three different substances.
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We are given 263 grams of xenon, five times 10 to the 23rd molecules of h2, and four moles of co2.
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And we are told that these are all at the same temperature and pressure.
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So they're at a constant temperature and pressure.
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And we want to know which one of these would occupy the largest volume.
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There is also an option here that says that these would all have the same volume.
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To determine how they relate in terms of volume, we need to think of avogadro's law.
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Avagadro's law says at a constant temperature and pressure, the volume is going to be directly proportional to the the number of moles of a gas.
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In other words, we need to compare the number of moles of each of gases that we have.
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We already have moles of co2, but the xenon is in grams and the hydrogen is in molecules.
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So we need to do a little bit of converting from a previous unit where we learned about grams, moles, and molecules...