Problem: What is the mass percent of carbon in oxalic acid, H2C2O4?

FREE Expert Solution

mass percent C=mass C in cpdmolar mass of cpd×100


mass C in H2C2O4 = 2 x 12 g = 24 g

molar mass H2C2O4:

2 H x 1 g = 2 g 

2 C x 12 g = 24 g

4 O x 16 g = 64 g

         sum = 90 g 


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What is the mass percent of carbon in oxalic acid, H2C2O4?

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