The drain cleaner, Drainex contains small bits of aluminium which react with caustic soda to produce hydrogen. What volume of hydrogen at 27°C and 0.831 bar will be released when 0.54 g of aluminium r

Question

The drain cleaner, Drainex contains small bits of aluminium which react with caustic soda to produce hydrogen. What volume of hydrogen at 27°C and 0.831 bar will be released when 0.54 g of aluminium reacts? (Al = 27)

TestHub · Accepted Answer

2Al + 2NaOH + 2H₂O → 2NaAlO₂ + 3H₂. n(Al) = 0.54/27 = 0.02 mol, so n(H₂) = (3/2)(0.02) = 0.03 mol. V = nRT/P = 0.03 × 0.0831 × 300 / 0.831 = 0.9 L = 900 ml. Confirms Ans: (c) 900 ml.

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