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`30g` ऐलुमिनियम का ताप `25^(@)C` से बढ़ाकर `45^(@)C` करने में आवश्यक ऊष्मा का मान `kJ` में ज्ञात करे।( (`Al` की मोलर ऊष्माधारिता `=24 JK^(-1)mol^(-1)`)

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ऐलुमिनियम का परमाणु द्रव्यमान `=27g mol^(-1)`
`:.30g` ऐलुमिनियम `=(30g)/(27gmol^(-1))=1.11 mol`
मोलर उष्माधारिता `(c )=(Q)/(MxxDeltat)`
प्रश्नानुसार ,`c=24JK^(-1)mol^(-1)`,
`M=1.11mol`,
`T_(1)=273+25=298 K`,
`T_(2)=273+45=318K`,
`:. Deltat=318-298=20K`.
अतः, `24 JK^(-1) mol^(-1)=(Q)/(1.11molxx20K)`
या, `Q=24JK^(-1)mol^(-1)xx1.11molxx20K`
`=532.8J`
`=0.533kJ`.

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