Question

0.9 aluminium react with dilute HCl to give H2 the volume of H2 evolved at STP is atomic weight of Aluminium is equal to 27

Answer 1

Hi there,

The equation

● 2Al + 6 HCl => 3H2 + 2 AlCl3

● 2Al => 3H2

☆ From the equation

2 mol of Al produces 3 mole of H2

No of moles of Al is 0.9 ÷ 27 = 0.03 mol

☆ So the no of H2 produces is 0.03 × 3 ÷ 2 = 0.045 mol

☆ The volume of hydrogen = moles × 22.4

Volume = 0.045 × 22.4 = 1.008 l

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