c
$W + Q _{1}= Q _{2}$
$W = Q _{2}- Q _{1}$
$C.O.P. =\frac{ Q _{1}}{ W }=\frac{ Q _{1}}{ Q _{2}- Q _{1}}=\frac{273}{300-273}=\frac{ Q _{1}}{ W }$
$W =\frac{27}{273} \times 80 \times 100 \times 4.2$
$Q _{2}= W+Q_{1}$
$Q _{2}=\frac{27}{273} \times 80 \times 100 \times 4.2+80 \times 100 \times 4.2$
$Q _{2}=\frac{300}{273} \times 80 \times 100=8791.2 cal$
