An object with a mass of $18 kg$ , temperature of $240 ^oC$ , and a specific heat of $8 J/(kg*K)$ is dropped into a container with $48 L$ 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 · 2017-04-17T11:38:53

The water does not evaporate and the change in temperature is $=0.17ºC$

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 $DeltaT_o=240-T$

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

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

$C_o=0.008kJkg^-1K^-1$

$18*0.008*(240-T)=48*4.186*T$

$240-T=(48*4.186)/(18*0.008)*T$

$240-T=1395.3T$

$1396.3T=240$

$T=240/1396.3=0.17ºC$

As $T<100ºC$ , the water does not evaporate.

An object with a mass of 18 kg18 kg, temperature of 240 ^oC240 ^oC, and a specific heat of 8 J/(kg*K)8 J/(kg*K) is dropped into a container with 48 L 48 L of water at 0^oC 0^oC . Does the water evaporate? If not, by how much does the water's temperature change?