Question

follows: Ca(s) + O2(g) + CaO(s) 2a. 2b. 2c. 2d. 2e. Balance the reaction equation. Which substance is the limiting reactant? Show all calculations. How many grams of excess reactant remain? What is the theoretical yield (in grams) of calcium oxide? What is the % yield if only 3.80g of calcium oxide was produced? (2) (4) (2) (2) (2)

Answer 1

. مع caois) ca (S) 02 (g) is Balanced equation L.H.B. R.H.S. ca ca=1&2 = 2 ca-1x2=2 2 1x2 = 2 0 © COLO. 2 ca t 02 25. Limiting meagent ;-- Cov) (reactant) :- or involves two If a reaction reactant the more reactant, then the amount consumed first limiting called as limiting of product is reactant! os limiting that gives the smaller The reactant 100) reactant Product reagent įs called limiting amount of

IS 2 2 CCAOCS) can we ca gives 02 2 moles of cao. 1 mole of 1 Product (2 moles of cao) 2 ca(s) + 02 (9) use mole - mde relationship a moles of gives 2 moles of cao Limiting of sos moles of 2 used reactant means which reagent of product. smaller amount gives I mole 02 gives Here Endless gives amoles of Here ca 80, compare cao. of moles, but product number more thaw 02 given is lesser amount we can say ca is from this . rreactant the limiting (08) al 4 & mole of r 2 moles of cao Emoles of ca сао la moles of cax emoles of cao + 4 moles 2 mole of og X of cao Produced Imole of O2 cais Imolep of cao ca is limiting reagent

the nrol.. use weight weight we can relationship to2 (97 cao qca (s2 (S) Hog. mass - atomic ca molecular mass - 329. 2 그 of ca axuo g. 2 moles of cao. = 56 g uo 16 56 of cao. (%) 80 g. of ca=2x56g. = 112g. of 112 g. of cao gives of g. 02 (ii) 32 two from state ments ca produce of Product . amount 8 desser 8og. amount excess ca more ar 02 [12g.cao. gives Procluces. when 4 moly of wed amoles produces cao af the excess reagent is 02 ६०१ ca is the limiting reant

finally tel mole of gives I mole of ca cao of of gives = rmoles of cao I mole limiting ca so } sreagents Excess 02 acao (s) 2c. to 29 2 caso moles o of each each of If ca and 2 then are taken 02 z moles of Cao 2moles of ca z moles of of 02 ll I mole If cao 1 umoles of 02 al moles of cao 2 that means =lmoles 1/2 mole we ye cao. o 02 that m means Oz produce imole excess produced at cao

that a reactant is not completely is aften called as Consumed reactant. encess equation the moles of cao. at from actually e mole of o2= produce a moles of cao. But 20 02 remains in a reaction. inolee lie. 32g.az of is a reaction. Or 02 is remain in Ang! 32g. of in reaction reagent. is reanaine as enecess is excess reagent so, 02 to find out we can this way the amound of product formed ying both the reactans,

theoritical Yield of calcium onide. theoretical Yield 6 2d 72cao (5) 2 caso o2 g) chemical in a the critical yield reaction, limiting reagent is the determine how that the reactant anade. are the Products much of of Product that amount the The maximum is called produced be can cao. q of moles 20, 2 X 56 means d cao 112g. of 1129 yield of cao ,.. theoritical

Re % yield if only 3.80g. of cao produced the actual gied. this is of cao 1129 theoritical Yield c 3.80 g Actual yield of cao Actual yield X 100 . % of yield- theoritical yield 3.80 X 100 1 1 2 5010339 X 100 3.39