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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? 

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Aluminium reacts with caustic soda in accordance with the reaction

The reaction of aluminium with caustic soda can be represented as:

Therefore volume of hydrogen at STP released when 0.15g of Al reactsv

=0.15 x 3 x 22.4 /54 = 187ml

Now P1 = 1 bar,

P2 = 1 bar

T= 273 K

T= 20 + 273 = 293 K

V= 187 ml

V2 = x

When pressure is held constant,then

V2 = P1 V1 T/ P2 T1

OR

x = 1 X 187 X 293 / 0.987 X 273

= 201 ml

Therefore, 201 mL of dihydrogen will be released

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The reaction of aluminium with caustic soda can be represented as: 

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