Chemistry Homework Help: Answers & Questions

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hello. I would like your help with a polymer chemistry HW.
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A 24.2 L sample of Hydrogen gas is held at 1.5 atm and 20 oC, how many grams of the gas are present
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How do I do these stoichiometry problems?
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I need step by step help on these problems. In preparation for an exam.
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How many atoms are there in 0.81L of SO3 at STP?
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Can someone explain why its A and not B or C. Thank you
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