The oxides of Na & K contained in sample of 0.5 gm of feldspar were converted?

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The oxides of Na & K contained in sample of 0.5 gm of feldspar were converted to the respective chlorides. the weight of the chlorides thus obtained was 0.118 gm. Treatment of the chlorides with AgNO3 gave 0.2451 gm of silver chloride. What is the percentageof Na2O & K2O in the sample???
 
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