The Total solution for NCERT class 6-12
Step I. Calculation of thevolume of hydrogen released under N. T.P. conditions.The chemical equation for the reaction is :2Al + 2NaOH + 2H2O →2NaAl02 + 3H22×27=54 g Sod. meta aluminate 3×22400 mL54g of Al at N.T.P. release H2 gas= 3 × 22400 mL0.15g of Al at N.T.P. release H2 gas= (3×22400mL)×(0.15g)(54g) =186.7mL.Step II.Calculation of volume of hydrogen released at 20°C and 1 bar pressure.