0.4 g of a mixutre containing sodium oxalate `(Na_2C_2O_4)` and potassium oxalate requires 50 " mL of " `(M)/(60)K_2Cr_2O_7` solution in acidic medium for complete reaction. Calculate the percentage composition of the mixture.

Explanation

To solve the problem of determining the percentage composition of a mixture containing sodium oxalate (Na₂C₂O₄) and potassium oxalate (K₂C₂O₄), we can follow these steps:

### Step 1: Define Variables
Let:
- \( x \) = mass of sodium oxalate (Na₂C₂O₄) in grams
- \( 0.4 - x \) = mass of potassium oxalate (K₂C₂O₄) in grams

### Step 2: Determine Molar Masses
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