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Q = 500 cal
m = 400 g de hierro
T₀ = 20 ⁰C
Cp = 0.114 cal / g °C
Tf = ?
Formula
Q = m Cp (Tf - T₀)
Q / m Cp = Tf - T₀
Q / m Cp + T₀ = Tf
Tf = 500 cal / (400 g)(0.114 cal / g °C) + 20 ⁰C = 30.96 ⁰C