Question

Polychlorinated biphenyls (PCBs), which were formerly used in the manufacture of electrical transformers, are environmental and health hazards. They break down very slowly in the environment. The decomposition of PCBs can be represented by the equation 2CH.CI + 230, + 2H, 0 24C0, + 12 HCI How many moles of water are needed to react with 10.0 mol 0,2 moles of water: How many grams of HCI are produced when 15.2 mol H, reacts? HCI produced: How many moles of Co, are produced when 76,5 g HCl is produced? CO, produced: mol How many grams of C,H.Cl, are reacted when 100.25 g CO, is produced? C,,HCI, reacted:

Answer 1

2 42 44 cl +232 +240 -> 2460 + 12 Hal From equation. 23 moles o react with a moles it lo moles of of react with = 10 x2) moles of to moles of to=0.8696 moles From equation 2 moles to 2 moles to produce 12 moles Hel 15.2 moles H2O produce = - 15.2 X12) meles = Hol moles of Hel=91-2 moles. molar maps of Hel= 36.58lmol mass of Hal moles of Hela ' inelar mand of Hal o mass of te 91-2= 36.5 mass of He=3328.887 Dans moles of Hal = mass of HCl molar mass of 76.5 - 22.096 36.5 Hol From equation: 12 moles of Hcl formed along with 24 moles ca 2.096 moles Het formed along with a 2-024 X24) males com moles of co= 4.192 moles in the clamolarmass = 361 gimol co: molar mass = 448lman from equation 24 moles co required a moles alt, el ( 24% 4 41 Y co, Aeºui 2 ( 2x 3 (118) C , c, 1856 gr cq required 72298 42 Half 180-25 gr co required = 100.25 +72 27 gx 9 att ha mass of e2H al = 68.542 gy

eie Hy clo molar mass = 361 glmol Hel: molar mass = 36.5 glmol mass of a 24 cl = 2500 gr. From equation: Las KE z moles a tal produre 12 moles Hel (243611 gr q2 it, che produce (12x 36-5288 Hal 22 gr 92 H el produce 43888 HCl 2500 8 42 te lo produce = 2 / 2 ore 2500x438) or to mass of Hela 1516-62 gr.