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Limiting reagent, percent yield and percent excess
NEET level
Single correct option
Difficulty 1 of 3
mc058
In
2
H
X
2
+
O
X
2
2
H
X
2
O
,
4
g
of
H
X
2
is ignited with
24
g
of
O
X
2
(
H
=
1
,
O
=
16
). What mass of which reactant is left over after complete reaction?
A
−
8
g
of
O
X
2
B
2.5
g
of
H
X
2
C
1
g
of
H
X
2
D
2
g
of
H
X
2
Answer: C
H
X
2
= 2 mol,
O
X
2
= 0.75 mol. 0.75 mol
O
X
2
needs 1.5 mol
H
X
2
, which is less than 2 mol, so
O
X
2
is limiting.
H
X
2
left = 2 - 1.5 = 0.5 mol = 1 g.
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