Question

Find the heat given off if 1 kg of 125 degree C steam is cooled to 50 degree C water.

Answer 1

• T_i=125°C=398K
• T_f=50°C=323K
• c=4184J/kg°K
• m=1kg
• ∆T=T_f-T_i=398-323=75K

$\\ \sf{:}\Rrightarrow Q=mc\Delta T$

$\\ \sf{:}\Rrightarrow Q=1(4184)(75)$

$\\ \sf{:}\Rrightarrow Q=313800J$

$\\ \sf{:}\Rrightarrow Q=313.8KJ$