$2.$ His used to scrub NCHO $($formaldehyde$)$ from a waste gas stream in an absorption column t flow rates contains $500$ kgh HOHO and $1900$ kgh N$,$ and is at $60$C$.$ The ratio of water to waste g flow rates $4$:$1$ The waste gas is fed into the bottom of the absorption column and meets a counter current stream of HO entering the top of the column at $20$C$.$ The scrubbed N$,$ leaves the top of the column $20$c $(1)$ What is the flow rate of the RO$-$HCHO solution leaving the base of the column? Assume that t the HCHO is scrubbed from the waste gas and dissolves in the water. $($ii$)$ What is the temperature of the HO$-$HCHO solution which leaves the base of the column? Hints: $(1)$ Assume datum$/$reference temperature $($To$)$ as $0$C$,(2)$ Energy in Energy out $+$ Accumulation, $(3)$ Energy $-$ Stream flow rate x Specific heat x Change in temperature $($T$-$Ta$)$ Where accumulation could be a heat of reaction or heat of solution $1\mathrm{.}04$ klkg K $1\mathrm{.}18$ kJkgK $4\mathrm{.}187$ kJkgK $-87\mathrm{.}9$ kimol $4\mathrm{.}187$ kJkg Specific heat of N$.($gas$)$ Specific heat of HO$-$HCHO solution Heat of solution of formaldehyde in water H$-1$:C$-12$; O $=16$; N$-14$