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What is the mass percent of carbon in oxalic acid, h2c2o4?

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First, need to identify the molar mass of oxalic acid using the molar masses of its composing atoms.

Hydrogen - 1.008 g/mol
Carbon - 12.011 g/mol
Oxygen - 15.999 g/mol

Adding the molar masses of the composing atoms, we obtain the molar mass of oxalic acid (HX2CX2OX4)(\ce{H2C2O4}):

(2×1.008)+(2×12.011)+(4×15.999)=90.034 g/mol(2\times 1.008 )+(2\times 12.011)+(4\times 15.999 )=90.034~\text{g/mol}

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