An object with a mass of $4 kg$ , temperature of $261 ^oC$ , and a specific heat of $8 (KJ)/(kg*K)$ is dropped into a container with $31 L$ 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 · 2017-07-02T07:55:35

The water does not evaporate and the change in temperature is $=51.6ºC$

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 $DeltaT_o=261-T$

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

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

$C_o=8kJkg^-1K^-1$

$4*8*(261-T)=31*4.186*T$

$261-T=(31*4.186)/(4*8)*T$

$261-T=4.0551875T$

$5.0551875T=261$

$T=261/5.0551875~~51.6ºC$

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

An object with a mass of 4 kg4 kg, temperature of 261 ^oC261 ^oC, and a specific heat of 8 (KJ)/(kg*K)8 (KJ)/(kg*K) is dropped into a container with 31 L 31 L of water at 0^oC 0^oC . Does the water evaporate? If not, by how much does the water's temperature change?