$5($a$)\_\backslash$#$1$: The following table gives data, in Btu, for a system undergoing a power cycle consisting of four processes in series. Determine $($a$)$ the missing table entries, each in Btu, and $($b$)$ the thermal efficiency. $(41\mathrm{.}7\backslash \%)$

$\backslash$begin$\{$tabular$\}\{|$c$|$c$|$c$|$c$|\}$

$\backslash$hline Process & $\backslash (\backslash$Delta $\backslash$mathrm$\{$E$\}\backslash )($Btu$)$ & Q $($Btu$)$ & W $($Btu$)\backslash \backslash$

$\backslash$hline $\backslash (1-2\backslash )$ & $-1200$ & $0$ & $\backslash \backslash$

$\backslash$hline $\backslash (2-3\backslash )$ & & $-700$ & $\backslash \backslash$

$\backslash$hline $\backslash (3-4\backslash )$ & & $0$ & $-700\backslash \backslash$

$\backslash$hline $\backslash (4-1\backslash )$ & $1200$ & & $0\backslash \backslash$

$\backslash$hline Cycle & & & $\backslash \backslash$

$\backslash$hline

$\backslash$end$\{$tabular$\}$