Resposta :
Q1+Q2=0
Q=m*c*Δt
80*c*(86-25) + 240*1*(86-90) = 0
80c * (61) + 240*(-4) = 0
4880c - 960 = 0
4880c = 960
c = 960/4880
c = 0,1967 cal/g*°C
arredondando
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c= 0,20 cal/g*°C // Letra D
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Q=m*c*Δt
80*c*(86-25) + 240*1*(86-90) = 0
80c * (61) + 240*(-4) = 0
4880c - 960 = 0
4880c = 960
c = 960/4880
c = 0,1967 cal/g*°C
arredondando
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c= 0,20 cal/g*°C // Letra D
*****************************