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National and Regional Contests
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USA Physics and Chemistry Contests
National Chemistry Olympiad
2010 National Chemistry Olympiad
8
8
Part of
2010 National Chemistry Olympiad
Problems
(1)
2010 USNCO Local #8: Highest Percentage by Mass
Source:
11/21/2012
Which compound contains the highest percentage of nitrogen by mass?
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(
A
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<
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NH
2
OH
(
M
=
33.0
)
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(
B
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NH
4
NO
2
(
M
=
64.1
)
<span class='latex-bold'>(A)</span> \text{NH}_2\text{OH} (M=33.0) \qquad<span class='latex-bold'>(B)</span>\text{NH}_4\text{NO}_2 (M=64.1)\qquad
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(
A
)
<
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>
NH
2
OH
(
M
=
33.0
)
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b
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(
B
)
<
/
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p
an
>
NH
4
NO
2
(
M
=
64.1
)
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(
C
)
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>
N
2
O
3
(
M
=
76.0
)
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a
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c
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a
t
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x
−
b
o
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d
′
>
(
D
)
<
/
s
p
a
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>
NH
4
NH
2
CO
2
(
M
=
78.1
)
<span class='latex-bold'>(C)</span>\text{N}_2\text{O}_3 (M=76.0)\qquad<span class='latex-bold'>(D)</span>\text{NH}_4\text{NH}_2\text{CO}_2 (M=78.1)\qquad
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′
l
a
t
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x
−
b
o
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>
(
C
)
<
/
s
p
an
>
N
2
O
3
(
M
=
76.0
)
<
s
p
an
c
l
a
ss
=
′
l
a
t
e
x
−
b
o
l
d
′
>
(
D
)
<
/
s
p
an
>
NH
4
NH
2
CO
2
(
M
=
78.1
)