Chemistry Homework Help

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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?

Jun 9th, 2015

Thank you for the opportunity to help you with your question!

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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Jun 9th, 2015

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