A 0.500 g sample containing Na2C2O4 (molar mass 134 g mol^-1) and inert matter requires 30.0 mL of 0.0200 M KMnO4 in hot acidic solution. Calculate the mass percent of Na2C2O4 (one decimal).

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JEE Main levelNumerical answerDifficulty 2 of 3eq067

A $0.500 g$ sample containing $Na X_{2} C X_{2} O X_{4}$ (molar mass $134 g mo l^{- 1}$ ) and inert matter requires $30.0 mL$ of $0.0200 M$ $KMnO X_{4}$ in hot acidic solution. Calculate the mass percent of $Na X_{2} C X_{2} O X_{4}$ (one decimal).

Numerical answer type, answer in %, tolerance 0.1.

Answer: 40.2 %

mol KMnO4 = 0.0300 x 0.0200 = 6.00e-4; mol oxalate = 2.5 x 6.00e-4 = 1.500e-03. Mass = 1.500e-03 x 134 = 0.2010 g; percent = 0.2010/0.500 x 100 = 40.20, about 40.2%.

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A $0.500 g$ sample containing $Na X_{2} C X_{2} O X_{4}$ (molar mass $134 g mo l^{- 1}$ ) and inert matter requires $30.0 mL$ of $0.0200 M$ $KMnO X_{4}$ in hot acidic solution. Calculate the mass percent of $Na X_{2} C X_{2} O X_{4}$ (one decimal).