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ICSE Class 10 Chemistry 2018 Solved Paper

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Aluminum carbide reacts with water according to the following equation :
Al4C3+12H2O→4‌Al(OH)3+3CH4
[Relative molecular weight of Al4C3=144; Al(OH)3=78]
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Question : 56
Total: 80
What mass of aluminum hydroxide is formed from 12g of aluminum carbide?
Solution:  
Al4C3+12H2O→‌4‌Al(OH3)+3CH4
144‌gm‌‌‌4×78‌gm‌3×22.4
If 144‌gm‌Al4‌C3 forms 312‌gm of Al(OH)3 then 12‌gm of Al4C3 forms ‌
4×78
144
×12
=26‌gm
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