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参考・概略です

 c[J/(g・K)]×100[g]×(90-27)[K]
 ={c×100×63}[J]
 =6300c[J]

 {84[J/K]+4.2[J/(g・K)]×170[g]}×(27-24)
 ={(84+714)×3}[J]
 =2394[J]

 6300c=2394
   c=0.38

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