ICSE Class 10 Chemistry 2016 Solved Paper

Question : 27

Total: 85

How much Calcium oxide is formed when 82g of calcium nitrate is heated? Also find the volume of nitrogendioxide evolved :
‌2‌Ca(NO3)2→2‌CaO+4NO2+O2
‌(Ca=40,N=14,O=16)

Solution:

2‌Ca(NO3)2

∆

───▸

2‌CaO

4NO2

‌2[40+2(14+48)]

‌

2(40+16)

‌

4‌ moles

=328‌gm

‌

=112‌gm

‌

=4×22.4

‌

=89.6l

1. If 328g of Ca(NO3)2 releases 112 gm of CaO
Then 82g of Ca(NO3)2 will ‌ releases ‌=‌

112

328

×82
=28‌gms‌ of ‌CaO
2. If 328g of Ca(NO3)2 releases 89.6l of NO2 at STP
Then 82g of Ca(NO3)2 will releases
‌=‌

89⋅6

328

×82
‌=22.4‌ litres of ‌NO2.

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