the quantity in moles of ( NH 4 ) 2 Cr 2 O 7 if 63 ‌ gm of ( NH 4 ) 2 Cr 2 O 7 is heated.

ICSE Class 10 Chemistry 2015 Solved Paper

Consider the following reaction and based on the reaction answer the questions that follow :
(NH4)2Cr2O7

‌ heat ‌

─────▸

N2(g)+4H2O(g)+Cr2O3
Calculate:

Question : 60

Total: 85

the quantity in moles of (NH4)2Cr2O7 if 63‌gm of (NH4)2Cr2O7 is heated.

Solution:

(NH4)2Cr2O7

∆

───▸

‌N2↑

4H2O

‌Cr2O3

2(14+4)+(52×2)

‌

=2×14‌

‌

=2×52

+(16×7)

‌

=28‌gm

‌

+3×16

=36+104+112=252‌gm

‌

=152‌gm

‌ No. of Moles ‌‌=‌

‌ Wt. of ‌(NH4)2Cr2O7

‌ Gram. Mol. Mass ‌

‌=‌

252

=0.25‌ moles ‌

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