Question $9(10$ points$)$

In an adiabatic process for a closed system, if the operator uses an electrical heater to heat the $10$ litr water

with power of $100$ W for almost $10$ min where the entropy of working fluid increases by $1\mathrm{.}6k\frac{J}{k}g.K,$ and then

turn it off for $20$ min afterward, where the entropy of working fluid still increases by $0\mathrm{.}6k\frac{J}{k}g.K,$ what is the

total entropy generation $(k\frac{J}{k}g.K)$ in the system? $(10$ points$)$