sidential waste nas tne components presented in the table.

$\backslash$table$[[\%,$Component$],[30,$Al cans$],[35,$Paper$],[35,$Rubber$]]$

i$.$ Estimate its moisture concentration using the typical values from the table at the end of the exam paper.

ii$.$ Calculate the mass of the dry waste for each component.

iii. Using the tables at the end of the exam paper, estimate the mass of $C,H,O,N,S$ and ash in each component.

iv$.$ Hence or otherwise estimate the approximate chemical formula for the waste.

$(11$ marks$)$

$\backslash$table$[[,$Percentages by mass $($on dry bases$)],[$Component$,$Carbon,Hydrogen,Oxygen,Nitrogen,Sulfur,Ash,$],[$Food waste,$48\mathrm{.}0,6\mathrm{.}4,37\mathrm{.}6,2\mathrm{.}6,0\mathrm{.}4,5\mathrm{.}0,],[$Paper$,43\mathrm{.}5,6\mathrm{.}0,44\mathrm{.}0,0\mathrm{.}3,0\mathrm{.}2,6\mathrm{.}0,],[$Cardboard$,44\mathrm{.}0,5\mathrm{.}9,44\mathrm{.}6,0\mathrm{.}3,0\mathrm{.}2,5\mathrm{.}0,],[$Plastics$,60\mathrm{.}0,7\mathrm{.}2,22\mathrm{.}8,-,-,10\mathrm{.}0,],[$Textiles$,55\mathrm{.}0,6\mathrm{.}6,31\mathrm{.}2,4\mathrm{.}6,0\mathrm{.}15,2\mathrm{.}5,],[$Rubber$,78\mathrm{.}0,10\mathrm{.}0,-,2\mathrm{.}0,-,10\mathrm{.}0,],[$Leather$,60\mathrm{.}0,8\mathrm{.}0,11\mathrm{.}6,10\mathrm{.}0,0\mathrm{.}4,10\mathrm{.}0,],[$Garden trimmings,$47\mathrm{.}8,6\mathrm{.}0,38\mathrm{.}0,3\mathrm{.}4,0\mathrm{.}3,4\mathrm{.}5,],[$Timber$,49\mathrm{.}5,6\mathrm{.}0,42\mathrm{.}7,0\mathrm{.}2,0\mathrm{.}1,1\mathrm{.}5,],[\backslash$table$[[$Mixture of organic$],[$materials$]],48\mathrm{.}5,6\mathrm{.}5,37\mathrm{.}5,2\mathrm{.}2,0\mathrm{.}3,5\mathrm{.}0,],[$Dirt$,$ ash, bricks etc... $\mathrm{.}5,26\mathrm{.}3,3\mathrm{.}0,2\mathrm{.}0,0\mathrm{.}5,0\mathrm{.}2,68\mathrm{.}0,]]$

Table $(2\mathrm{.}1)$: Moisture content of uneompacted refuse components $2,6,10,24,25,46.$

$\backslash$table$[[$component$,$Moisture content$],[$Range$,$Typical,$],[$Residential$,2-4,3,],[$Aluminum cans,$4-8,5,],[$Cardboard$,6-12,8,],[$Fines $($dirt$,$ etc.$),50-80,70,],[$Food waste,$1-4,2,],[$Glass$,40-80,60,],[$Grass$,8-12,10,],[$Leather$,2-4,2,],[$Non$-$ferrous Metal,$20-40,30,],[$Leaves$,4-10,6,],[$Paper$,1-4,2,],[$Plastics$,2-6,3,],[$Ferrous metals,$1-4,2,],[$Rubber$,2-4,3,],[$Steel cans,$6-15,10,],[$Textiles$,15-40,20,],[$Wood$,30-80,60,],[$Yard waste,$30-80,60,],[$Garden trimmings,,$],[$Commercial$,50-80,70,],[$Food waste,$10-60,25,],[$Mixed organics,$10-25,15,],[$Mixed$,10-30,30,],[$Wooden shipping crates and plant scales,$2-15,8,],[$Construction $($mixed$),6-12,8,],[$Dirt$,$ ashes, bricks $...$ Etc.,$15-40,,],[$Municipal waste,,,$]]$