ICSE Class 10 Chemistry 2016 Solved Paper - Question 27 | ...

ICSE Class 10 Chemistry 2016 Solved Paper

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Question : 27 of 85

Marks: +1, -0

How much Calcium oxide is formed when

82 {\g}

of calcium nitrate is heated? Also find the volume of nitrogendioxide evolved :

\;2 {\Ca} ( {\NO}_3) _2 → 2 {\CaO}+4 {\NO}_2+ {\O}_2

\;( {\Ca}=40, {\N}=14, {\O}=16)

Solution:

\table 2 {\Ca} ( {\NO}_3) _2 ,\ { ───▸} ↖{∆}, 2 {\CaO},+,4 {\NO}_2,+, {\O}_2; \;2[40+2(14+48)], , 2(40+16) ,,4 \;\text " moles "\ ; =328 {\gm} , ,=112 {\gm},,=4 × 22.4; ,,,,=89.6 l

1. If

328 {\g}

of

{\Ca} ( {\NO}_3) _2

releases 112

{\gm}

of

{\CaO}

Then

82 {\g}

of

{\Ca} ( {\NO}_3) _2

will

\;\text " releases "\;=\;{112}/{328} × 82

=28 {\gms} \;\text " of "\; {\CaO}

2. If

328 {\g}

of

{\Ca} ( {\NO}_3) _2

releases

89.6 l

of

{\NO}_2

at STP
Then

82 {\g}

of

{\Ca} ( {\NO}_3) _2

will releases

\;=\;{89 ⋅ 6}/{328} × 82

\;=22.4 \;\text " litres of "\; {\NO}_2 .

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