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 0.15 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 0.15 g of aluminium reacts? (Al = 27)

Prashant Kotian · Accepted Answer

Correct answer: A. reaction: 2 al + 2 naoh + 6 h2o → 2 na[al(oh)4] + 3 h2. moles of al = 0.15 / 27 = 0.00556 mol. moles of h2 = 1.5 × 0.00556 = 0.00833 mol. using pv = nrt with r = 0.08314 l-bar/k-mol: v = 0.00833 × 0.08314 × 300 / 0.831 = 0.250 l = 250 ml.

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