Question
The drain cleaner, Drainex contains small bits of aluminum which react with caustic soda to produce dihydrogen. What volume of dihydrogen at 20 °C and one bar will be released when 0.15g of aluminum reacts?
Solution
The chemical equation for the reaction is
2 Al + 2 NaOH + H20 -> 2 NaAl02 + 3H2 (3 x 22400 mL At N.T.P)
2 x 27 = 54 g.
54 g of Al at N.T.P release
H2 gas = 3 x 22400 0.15 g of Al at N.T.P release
`H_2 " gas" = (3xx22400xx0.15)/54`
= 186.7 mL
N.T.P condition `V_1` = 186.7 mL , `V_2 = ?`
`P_1` = 1.013 bar , `P_2` = 1 bar
`T_1` = 0 + 273 = 273 K, `T_2` = 20 + 273 = 293 K
Accourding to gas equation
`(P_1V_1)/T_1 = (P_2V_2)/T_2` or` V_2 = (P_1V_1T_2)/(P_2T_1)`
`V_2 = (1.013 "bar" xx 186.7 mL xx 293K)/ (1 "bar" xx 273 K)`
= 203 mL
Is there an error in this question or solution?
Solution The Drain Cleaner, Drainex Contains Small Bits of Aluminum Which React with Caustic Soda to Produce Dihydrogen. What Volume of Dihydrogen at 20 °C and One Bar Will Be Released When 0.15g of Aluminum Reacts? Concept: Laws of Chemical Combination - Avogadro Law.
