# An object with a mass of 3 kg, temperature of 331 ^oC, and a specific heat of 18 (KJ)/(kg*K) is dropped into a container with 42 L  of water at 0^oC . Does the water evaporate? If not, by how much does the water's temperature change?

Feb 5, 2018

The water does not evaporate and the change in temperature is $= {77.8}^{\circ} C$

#### Explanation:

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 $\Delta {T}_{o} = 331 - T$

${m}_{o} {C}_{o} \left(\Delta {T}_{o}\right) = {m}_{w} {C}_{w} \left(\Delta {T}_{w}\right)$

The specific heat of water is ${C}_{w} = 4.186 k J k {g}^{-} 1 {K}^{-} 1$

The specific heat of the object is ${C}_{o} = 18 k J k {g}^{-} 1 {K}^{-} 1$

The mass of the object is ${m}_{0} = 3 k g$

The volume of water is $V = 42 L$

The density of water is $\rho = 1 k g {L}^{-} 1$

The mass of the water is ${m}_{w} = \rho V = 42 k g$

$3 \cdot 18 \cdot \left(331 - T\right) = 42 \cdot 4.186 \cdot T$

$331 - T = \frac{42 \cdot 4.186}{3 \cdot 18} \cdot T$

$331 - T = 3.26 T$

$4.26 T = 331$

$T = \frac{331}{4.26} = {77.8}^{\circ} C$

As the final temperature is $T < {100}^{\circ} C$, the water will not evaporate