Chemistry Homework Help

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Question Description

Q4:

Aluminum granules are a component of some drain cleaners because they react with sodium hydroxide to release both energy and gas bubbles to help clear the drain clog.  The reaction is:

2NaOH  +  Al  +  6H2O    2NaAl(OH)4  +  3H2

(note: balance the reaction first)

What mass of Aluminum would be needed to produce 4L of hydrogen gas at STP?

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Explanation & Answer

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Balanced Reaction : 
2NaOH + 2Al + 6H2O ---> 2NaAl(OH)4 + 3H2 

Same as above , 
V = Moles * Constant 
4 = n * 22,4 
n = 4/22,4 = 0.1786 

Moles of Aluminium / Moles of Hidrogen = Coefficient of Aluminium / Coefficient of Hidrogen 
n / 0.1786 = 2 / 3 
n = 0.119 Mole 

M = n*Mr = 0.119* 27 = 3,213 grams

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qhvatchat (540)
Cornell University

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