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Stoichiometry of single and sequential reactions
JEE Main level
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Difficulty 2 of 3
mc132
11.2 g of iron and 4.8 g of sulphur are heated together to form FeS (
Fe
+
S
FeS
). The maximum mass of FeS formed is (
Fe
=
56
,
S
=
32
)
A
17.6
g
B
16.0
g
C
6.6
g
D
13.2
g
Answer: D
Moles: Fe = 11.2/56 = 0.20; S = 4.8/32 = 0.15. The reaction is 1:1, so S is limiting. FeS = 0.15 x 88 = 13.2 g (M of FeS = 88).
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