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Chemistry, 27.10.2021 14:00 selldotjr

I got the answer but I'm quite lost as to how my teacher got the answer. Please help. A substance is found to consist of 1.90 g of sulfur, and 2.09 g of oxygen. What is the percent by mass of oxygen in this compound?
52.4%

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I got the answer but I'm quite lost as to how my teacher got the answer. Please help. A substance...
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