Question

10/31/19 See page 289 15 Question (1 point) Chromium(II)oxide reacts with silicon as indicated by the balanced equation below. 2Cr,0,(s) +3Si(s) 4Cr(s) +3510,(s) When 155.0 g Cryog is reacted with 153.0 g Si, it is determined that Croy is the limiting reagent. 2nd attempt u See Periodic Table See Hint If the reaction begins with 155.0 grams of Cr2O3 and 153.0 grams of silicon, how many grams of the excess reactant will be used? gor Si used 35 OF 40 QUESTIONS COMPLETED < 15/40 > + VIEW SOLUTION SUBMIT ANSWER MacBook Pro

Answer 1

Molar mass of Cr₂O₃ is 151.9904 g/mol

Molar mass of Si is 28.08550 g/mol

moles in 155.0 g of Cr₂O₃ = 155 g / 151.9904 g/mol = 1.01980125061 mol

moles in 153.0 g of Si = 153 g / 28.08550 g/mol = 5.44765092307 mol

here also Cr₂O₃ is limiting reactant

so moles of Si used = (3/2) x 1.01980125061 mol = 1.52970187592 mol

mass of excess Si used = 1.52970187592 mol x 28.08550 g/mol = 42.9624420362 g ~ 42.9 g

mass of excess Si used = 42.9 g

10/31/19 15 Question (1 point) aSee page 289 Chromium(II) oxide reacts with silicon as indicated by the balanced equation below 4Cr(s)+3Sio,(s) 2Cr20,(s)+3Si(s) When 155.0 g Cr O3 is reacted with 153.0 g Si, it is determined that Cr2O3 is the limiting reagent 2nd attempt Jd See Periodic Table See Hint If the reaction begins with 155.0 grams of Cr2O3 and 153.0 grams of silicon, how many grams of the excess reactant will be used? 42.9 g of Si used SUBMIT ANSWER 15/40 + VIEW SOLUTION 35 OF 40 QUESTIONS COMPLETED X 30 MacBook Pro

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