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## Homework Statement

An 8.5 g ice cube at -10°C is put into a

Thermos flask containing 200 cm3

of water at 20°C. By how much has the

entropy of the cube-water system changed when equilibrium

is reached? The specific heat of ice is 2220 J/kg·K.

Cw= 4190

Mi= 8.5

Mw= 200

Lf= 333000

Ci=2220

## Homework Equations

Tf=cw*mw(20)-mi(lf+10ci)/mw*cw+mi*cw

Tf= 288.73 K

mi*ci*ln(273.15/263.15)+lf*mi/273.15+mi*cw*ln(288.73/273.15)+mw*cw*ln(288.73/293.15)

## The Attempt at a Solution

.70366+10.36+1.975-6.365

I got 6.67 J/k. But I'm not sure thats right.