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Asked Feb 24, 2020
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I'm not sure how to do this one. 

(26) The action of some commercial drain cleaners is based on the following reaction:
2 NAOH(s) + 2 Al(s) + 6 H2O(1) → 2 NaAl(OH)4(s) + 3 H2(g)
What is the volume of H2 gas formed at STP when 6.32 g of Al reacts with excess NaOH?
A) 3.50 L
B) 5.25 L
C) 7.87 L
D) 8.59 L
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(26) The action of some commercial drain cleaners is based on the following reaction: 2 NAOH(s) + 2 Al(s) + 6 H2O(1) → 2 NaAl(OH)4(s) + 3 H2(g) What is the volume of H2 gas formed at STP when 6.32 g of Al reacts with excess NaOH? A) 3.50 L B) 5.25 L C) 7.87 L D) 8.59 L

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Expert Answer

Given data:

Chemistry homework question answer, step 1, image 1

Calculations:

The molar mass of aluminium (Al) is 26.98 g/mol.

The number of moles of aluminium is calculated as shown below.

Chemistry homework question answer, step 2, image 1

The given reaction is shown below.

Chemistry homework question answer, step 2, image 2

In the above reaction, 2.0 mol of aluminium (Al) produces 3.0 mol of hydrogen gas (H2). Therefore, the number of moles of hydrogen gas produced by 0.234 mol of aluminium (Al) is calculated as shown below.

Chemistry homework question answer, step 2, image 3

At STP, the pressure (P) is 1.0 atm and temperature (T) is 273.15 K. The volume of the hydrogen gas is calculated by the formula shown below.

Chemistry homework question answer, step 2, image 4

Substitute the given data in above equation (I).

Chemistry homework question answer, step 2, image 5

...

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