6. Crols) +3 CC, (I) 2 CrCh(s) + 3 COC12 (aa) In one process, 124 g of Cr,0, rea

Question

6. Crols) +3 CC, (I) 2 CrCh(s) + 3 COC12 (aa) In one process, 124 g of Cr,0, reacted with 601 g of CCl (a) Calculate the mass (in grams) of Crcl, formed (theor (b) How much re yield of CrCl) excess reagent (in grams) is left at the end of the reaction? 7. Industrially, Vanadium metal, which is used in steel alloys, can be obtained by reacting vanadium (V) oxide with Ca at high temperatures: In one process 6.54 x 10' g of Ca react with 4.96 x 10' g of V,O, (a) Calculate the theoretical yield of Ca0

Explanation / Answer

Balanced equation:
5 Ca + V2O5 = 5 CaO + 2 V
Reaction type: single replacement

Moles of Ca = 6540 / 40.047 = 163.181 Moles

Moles of V2O5 = 4960 / 181.88 =  27.27 Moles  

Limiting reagent is V2O5

Moles of CaO produced =  136.35 Moles

Thoretical yield of CaO produced =  136.35 x 56.07 =  7646.35 gm

Percentage yield = acutal yield x 100 / Thoretical yield = 403 x 100 / 7646.35 = 5.27 %

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