Answer:
T = 15.03°C
Explanation:
given data:
copper specific heat = Sc = 0.385 J/g °C
iron specific iron = Si = 0.450 J/g °C
specific heat of ethanol = Se = 2.46 J/g °C
net heat loss is equal to zero
[tex](m*S*\Delta T)_{copper} +(m*S*\Delta T)_ {iron} +(m*S*\Delta T)_ {ethanol} = 0[/tex]
[tex]150*0.385 *( T - (-50)) + 200*0.450*(T - 120) + 300*2.46 * (T -20) = 0[/tex]
[tex]57.75( T - (-50)) + 0.90(T - 120) +738(T -20) = 0[/tex]
[tex]57.75T + 2887.5 + 0.90T - 108 + 738T - 14760 = 0[/tex]
[tex]57.75T + 0.90T+738T = - 2887.5 + 108+14760[/tex]
[tex]796.65T= 11980.5[/tex]
T = 15.03°C
