Question

What mass of Zn want required to produce hydrogen by the reaction with HCl. Such that the number of moles of Hydrogen produced is 3

Answer 1

Answer:

Zn  + 2HCl ---> ZnCl₂ + H₂

1 mole of Zn will liberate 1 mole of hydrogen

So, 65 g of Zn will liberate 1 mole of H₂

So, 195 g of Zn will liberate 3 moles of H₂ (multiplying by 3)

Answer 2

Answer:

3 moles ,mass=3×mass of zinc =3× 65 = 195gm

Explanation:

Zn + 2Hcl ----- ZnCl2 +H2

So if we compare the mole-mole relationship between H2 and Zn

So if we consume 1 mol of Zn then 1 mol of H2 is produced so for producing 3 mol of H2 we have to consume 3 mol of Zn

mass=3×mass of zinc =3× 65 = 195gm

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