NO is the limiting reagent

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2.7 ?????? ?????? ??????? Limiting Reagents
NO is the limiting reagent
O2 is the excess reagent
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???? ? (?) ??????? ??????? ?????? CrCl3 ???
???? ???? ?????????? ?? 2.0 ?? ?? Cl2 ? 1.0
???? ? (?) ??? ???? ???? ??? ????? ??????????
?????? ???????? ??????? ????? ?? ??????? ???????
(????? ????? ?????? 52 ??/??? ?????? ???????
?????? 2 x 35.5 71 ??/???) ??? ????? ??????
2 ?? 71 ??/??? 0.028 ??? ??? ????? ??????
1 ?? 52 ??/??? 0.019 ??? ???? ??? ??????
?? ???? ?????? ?????? ???? ??????? ? ??? ??????
??? ???? ???? ??? ?? ?? ?????????? ?????? 1 gm
?? ?????? 2 gm ??? ??????? ????? ??? ?????? ??
????? ??????? . ????? ?????? ?? ??? ????????
????? ?????? 2Cr(s)
3Cl2(g) ?? ???????? ????????
3.0 mol 2.00 mol ?? ???????
0.028 mol 0.019 mol
??? ?? 3.0 mol
x 0.019 mol 2.0 mol x 0.028 mol ??? ??? ??? ??
?? ?? ????? ?????????? ??? ?????? ????? ?? ?????
???????. ?? ?? ????? ??????? ??? ???? ?? ??????
???? . ????? ???? ????? ??? ????? ?????? ??????
????? ?? ?? ?????????? ???????
3Cl2(g)
2CrCl3(s) 2.0 mol
3.0 mol x mol
0.028 mol ??? ????? ?????? n x
(2.0 ??? x 0.028 ???) 3.0 ??? 0.0187 ??? ????
?? ????? ??????? ?????? 158.53 ?? ??? ???
???? ???? ?????? (?????? ???????) 158.53
??/??? x 0.187 ??? 3.0 ????
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(?) ??????? ?????? ?????? (?????? ??????? ??????)
?????? ??????? (2.1gm)
?????? ??????? (2.96gm) x 100 71 ???????
?? ???? ????? ?? ????? ??? ?????????? ????? ?????
???? ??????? 3.0 ?? ??? ????? . ???? ???? ??
????? ???? ??????.
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MCQ1 Ammonia reacts with diatomic oxygen to form
nitric oxide and water vapor 4NH3 5O2 ? 4NO
6H2O When 40.0 g NH3 and 50.0 g O2 are
allowed to react, which is the limiting
reagent?  A. NH3
B. O2 C. Neither reagent is
limiting.   MCQ2 Ammonia reacts with diatomic
oxygen to form nitric oxide and water vapor
4NH3 5O2 ?
4NO 6H2O When 20.0 g NH3 and 50.0 g O2 are
allowed to react, which is the limiting
reagent? 
A. NH3
B. O2 C. Neither reagent is
limiting. MCQ3 How many grams of Cl2 can be
prepared from the reaction of 16.0 g of
MnO2 and 30.0 g of HCl according to the
following chemical equation?
MnO2 4HCl ? MnCl2 Cl2 2H2O 
A. 0.82 g B. 5.8 g
C. 13.0 g D. 14.6 g
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????? ?????? MCQ A 1.375 g sample of mannitol,
a sugar found in seaweed, is burned completely in
oxygen to give 1.993 g of carbon dioxide and
0.9519 g of water. The empirical formula of
mannitol is  A. CHO B. CH7O3 C. C3H2O
D. C3H7O3 E. CH2O
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2.8 ????? ?????? ??????? Reaction Yield
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MCQ1 What is the theoretical yield of chromium
that can be produced by the reaction of 40.0 g of
Cr2O3 with 8.00 g of aluminum according to the
chemical equation below?
2Al Cr2O3 ? Al2O3 2Cr  A. 7.7 g B.
15.4 g C. 27.3 g D. 30.8 g E. 49.9
g MCQ2 Calculate the mass of excess reagent
remaining at the end of the reaction in which
90.0 g of SO2 are mixed with 100.0 g of O2.
2SO2 O2 ?
2SO3  A. 11.5 g B. 22.5 g
C. 67.5 g D. 77.5 g E. 400 g MCQ3
One way of obtaining pure sodium carbonate is
through the decomposition of the mineral trona,
Na5(CO3)2(HCO3)2H2O,
Na5(CO3)2(HCO3)2H2O(s) ? 5Na2CO3(s) CO2(g)
3H2O(g)When 1.00 metric ton (1 ? 103 kg) of
trona is decomposed, 0.74 metric ton of Na2CO3 is
recovered. What is the percent yield of this
reaction?  A. 93 B. 43 C. 22
D. 83 E. 17
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(MCQ) ??????? ???????? ????? ??????? (??? ?????
?? ????? ?????? ??????? 3.35 ??
??????? ??????? 8.3 ??) ?? (?) 52.4 (?) 64.5
(?) 40.4 (?) 76.5