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    [Chemistry] Homework problem I'm confused about.?

    When octane (C8H18) is burned in oxygen carbon dioxide and water are produced. If 320 g of octane are burned and 32 g of water are recovered, what is the percent yield of the experiment? The equation is 2C8H18 + 25O2 --> 16CO2 + 18H2O. Could anyone explain the steps of this to me? I feel...
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    People with religious pamphlets who go door to door...?

    So there was some Christian who wanted to show me religious pamphlets or whatever today at my door, and while I'm not interested in any of the sort I decided to humor her, but then it got me thinking. If there are people who do this, are there people who attempt to spread atheism by...
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    [Japanese] What's an appropriate level of politeness to use on the Internet?

    In terms of verb/adjective forms and whatnot.
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