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According to given reaction,
2×(1+14+48)=126g HNO₃ is produced from 3×(14+32)=138g NO₂
Similarly, 1g HNO₃ is produced from (138/126)g NO₂
and, 25.2g HNO₃ is produced from (138×25.2)/(126)=27.6g NO₂
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