An object with a mass of #4 kg#, temperature of #240 ^oC#, and a specific heat of #5 J/(kg*K)# is dropped into a container with #15L # of water at #0^oC #. Does the water evaporate? If not, by how much does the water's temperature change?

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Answer 1 · 2017-09-15T13:45:21

The water does not evaporate and the change in temperature is #=0.08^@C#

The heat is transferred from the hot object to the cold water.

Let #T=# final temperature of the object and the water

For the cold water, # Delta T_w=T-0=T#

For the object #DeltaT_o=240-T#

# m_o C_o (DeltaT_o) = m_w C_w (DeltaT_w)#

#C_w=4.186kJkg^-1K^-1#

#C_o=0.005kJkg^-1K^-1#

#m_0=4kg#

#m_w=15kg#

#4*0.005*(240-T)=15*4.186*T#

#240-T=(15*4.186)/(4*0.005)*T#

#240-T=3139.5T#

#3140.5T=240#

#T=240/3140.5=0.08^@C#

As #T<100^@C#, the water does not evaporate