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This would depend on the isotopes of carbon and oxygen. Assuming that the most common isotopes are in play, use the Atomic Mass of each to get

2x (1) hydrogen +

2x (12.01) carbon +

2x (15.99) oxygen = roughly 58

(2x carbon)/58 = roughly 24/58

multiply (24/58) by 100 to get a percentage

=41.379=41.38%

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Q: What is the mass percentage of carbon in H2C2O2?
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