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Tardigrade
Question
Chemistry
30 g of magnesium and 30 g of oxygen are reacted, then the residual mixture contains
Q.
30
g
of magnesium and
30
g
of oxygen are reacted, then the residual mixture contains
3307
187
Some Basic Concepts of Chemistry
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A
60
g
of magnesium oxide only
49%
B
40
g
of magnesium oxide and
20
g
of oxygen
12%
C
45
g
of magnesium oxide and
15
g
of oxygen
11%
D
50
g
of magnesium oxide and
10
g
of oxygen
28%
Solution:
2
m
o
l
2
M
g
+
1
m
o
l
O
2
→
2
m
o
l
2
M
g
O
30
g
of
M
g
=
24
30
=
1.25
m
o
l
and
30
g
of
O
2
=
32
30
=
0.9375
m
o
l
1.25
m
o
l
of
M
g
will react with
2
1.25
=
0.625
mole of oxygen
Thus magnesium is the limiting reagent and will be consumed completely.
Remaining oxygen
=
0.9375
−
0.625
=
0.3125
m
o
l
=
0.3125
×
32
=
10
g
M
g
O
formed
=
1.25
m
o
l
≡
1.25
×
40
=
50
g