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किसी तत्व के `9xx10^(23)` परमाणुओं का द्रव्यमान 99 ग्राम है | तत्व का परमाणु द्रव्यमान ज्ञात कीजिए |

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`because" तत्व के मोल "(n)=("कणों की संख्या")/(6.022xx10^(23))=(9xx10^(23))/(6.022xx10^(23))=1.49`
`:." तत्व का परमाणु द्रव्यमान (M)"=("तत्व के परमाणुओं का द्रव्यमान")/("मोल (n)")=(99)/(1.49)=66.44`

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