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Chemistry 10 Online
OpenStudy (anonymous):

The percentage by mass of elements in a particular pure substance will vary from sample to sample

OpenStudy (aaronq):

"pure substance"

OpenStudy (jfraser):

Do you think it matters whether you buy name brand sugar or generic sugar? Or which bag of sugar on the shelf? Or which store you buy the sugar at?

OpenStudy (anonymous):

It may help to think of a specific example. Would the percentage of oxygen in a glass of water vary with each glass you pour from your faucet?

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