Question

Objective Knowledge Check Question 6 Kalle Liquid octane (CH,(CH), CH will react with gaseous oxygen (O) to produce gaseous carbon dioxide (CO) and gaseous water (H,0). Suppose 4.579 of octane is mixed with 5.0 g of oxygen. Calculate the maximum mass of water that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits. XS ?

Answer 1

The greneral for mula of the Combwstion o alkane is aiven bthe fotoi oetane CH(e) Here tne alkoane 18 2 CgHig t(8+ 0 H20 8 C02 8 co 9 H20 2 eliminating the fraetion (multiplyirg tne tslo tuaton b 2). we aet-he balaneed eguation. 25 0 18 H20 t 16 CO 2Cg Hig 2 moler of eg1g aeb ith 25 moles ot O2 Producing 18 mole of H20 and lb moles of e0, NO Molar mas ot eg Hig 8x atomie wL of e' 4 18 Cx12)(8x) adomie . of ! 2114 mo Molas mak t 0, 2R16 mo 32 moi . A5 oCtane 4.578 14me 0.04 mot

0.156 mat 328me For complete combwstion f 0.04 mot cetane 2 moles af Eg Hig aquires 25 moes O for eomplete eomowton - 0.04 25x0.04 o.5 maler O, 2. 2. For Complete eombuition f o.04 mol ot oelane 8,5 molesof 0, ia raquired. but in ths eoaie 0156 mot ot 0 is p sed 50 02 h miting 9noagent in t case 25 moler o, eaets ith 2msles Cg Hig 2 1 25 0.156 20.156 25 0.0125 moles eg Hg. ;. 0.156 mole d0, completeleatr wrth 0.o125md egHi ex eom g Mg = O - 04-0.0125)- 0.0 275m Aeeordina to ths comburhion a oetane 25 mol oeompletelyneact With 2md of egHig iing 18mat ot H,0 18 25 1 25 O.156 2xo.15 18x0.156 1 25 25 O.112 mol H,0 :. 012mot ,o o.112m61* 183- 2.016% 2.02 of 02 eachs vi th 4.57gof oetane, the when 5 maximum 2.02 of H20 i^ for med.