Enter your answer in the provided box. Some commercial drain cleaners contain a

Question

Enter your answer in the provided box. Some commercial drain cleaners contain a mixture of sodium hydroxide and aluminum powder. When the mixture is poured down a clogged drain, the following reaction occurs: 2NaoH(aa) 2Al(s) 6H20 2NaAl(OH)4(aq) 3H20g) The heat generated in this reaction helps melt away obstructions such as grease, and the hydrogen gas released stirs up the solids clogging the drain. Calculate the volume of H2 formed at 27.5°C and 1.00 atm if 4.17 g of Al is treated with an excess of NaoH.

Explanation / Answer

Number of moles of Al = 4.17 g / 27.0 g.mol^-1 = 0.154 mole

from the balanced equation we can say that

2 mole of Al produces 3 mole of H2 so

0.154 mole of Al will produce

= 0.154 mole of Al *(3 mole of H2 /2 mole of Al)

= 0.231 mole of H2 will be produced

PV = nRT

V = nRT/P

V = (0.231*0.0821*300.5) / 1.00 = 5.70 L

Therefore, the volume of H2 formed will be 5.70 L

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