A 2.0 g sample containing Na2CO3 and NaH...

A 2.0 g sample containing `Na_2CO_3` and `NaHCO_3` loses 0.248 g when heated at 300° C, the temperature at which NaHC03 decomposes to `Na_2CO_3, CO_2` and `H_2O`. What is the percentage of `Na_2CO_3` in the mixture ?

0.3333

0.6666

0.25

0.5

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