The drain cleaner, Drainex contains small bits of aluminium which react with caustic soda to produce dihydrogen. What volume of dihydrogen at `20^(@)C` and one bar will be released when 0.15 g of aluminium reacts?

Options

A. 202.5 ml
B. 102.5 ml
C. 101. 25 ml
D. `405.0` ml

Answer

A

Explanation

`2 Al + 2 NaOH + 2 H_(2) O to 2 NaAlO_(2) + 3 H_(2) uarr` according to the reaction
`2 xx 27 g` of al releasing = 3 moles of `H_(2)`
0.15 g of Al releasing = `(3 xx 0.15)/(2 xx 27)` moles of `H_(2)`
from PV = nRT
`V = (nRT)/(P) = (3 xx 0.15 xx 0.082 xx 293)/(2 xx 27)`
`V = 202 . 5` ml