When zinc reacts with sulfuric acid, as shown here, what mass of hydrogen is produced from 31.8 g of zinc?
Zn + H2SO4 ⇒ ZnSO4 + H2

The answer to your question is 0.98 g of H₂

Explanation:

Data

mass of H₂ = ?

mass of Zn = 31.8 g

Balanced chemical reaction

                Zn  +  H₂SO₄  ⇒   ZnSO₄  +  H₂

Process

1.- Calculate the molar mass or atomic mass of Zinc and hydrogen

The Atomic mass of zinc = 65 g

The Molar mass of H₂ = 2 g

2.- Use proportions and cross multiplication to find the mass of H₂ formed.

                       65 g of Zn 2 g of H₂

                        31.8 g of Zn  x

                            x = (31.8 x 2) / 65

                            x = 63.6/65

-Result

                            x = 0.98 g of H₂

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

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