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First, consider that 1 mol of anything is 22.4L @ STP (standard temperature and pressure). Then consider that benzene's molecular weight is 78.11g/mol. So basically, 1 mol of benzene = 78.11g = 22.4L. Set up a simple proportion...

78.11g X grams

_____ = _______ X grams = 3.487 g or 3.49 grams (don't forget your sig figs!)

22.4L 1L

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Q: How much does a liter of benzene weigh?
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