Question

69. The zinc in a copper-plated penny will dissolve in hydrochloric acid if the copper coating is filed down in several spots (so that the hydrochloric acid can get to the zinc). The reaction between the acid and the zinc is 2 H+ (aq) + Zn(s) -> H2(g) + Zn (aq). When the zinc in a certain penny dissolves, the total volume of gas collected over water at 25 °C is 0.951 L at a total pressure of 748 mmHg. What mass of hydrogen gas is collected? MISSED THIS? Read Section 6.6; Watch KCV 6.6, IWE 6.11

Answer 1

NO ( Answer 8- (69) Given, Coppen-platad peny a The zinc inhydsochoic aciol. to Coppen in several pots diove Coatbr s Tha Aaaction between hydochloic aud w fled doun follous Zinc 2t 2HCoq/) zns) -> t,g) is o95 L ard Collectid The total volume af atu Oven ta total pusue of gas Saspecetivy to auton's bw af totol presuta s, Rсоg Рзаи + P. H20 Ptotai Joter asc to vapour pssue of TRan Pota Pp PHty 13.mnHg 24.22mm D.asa at Thus to pautiol Prusue of hydbon is o529 at..

ge No- numben of moles of hydbun Now, Coltulat tho foon idaal pas & o ollous PV RT Prersua of hydogn, vis ta tho Hua, p i's tea tan peae arol Volune, R is tho Unvusa/ is Cottant O:9529 atn x0ArIL L-actm mole k 0.03105 mol NO, Convert oles ofhyden to t mas of Collec tral over astollous ydhogn ydhogen = runber af molosxmolan ras HOus af 0 0310 mol x 2 moi mars of hydhogn TAus