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n200080 [17]
3 years ago
6

When zinc reacts with sulfuric acid, as shown here, what mass of hydrogen is produced from 31.8 g of zinc?

Chemistry
1 answer:
Alina [70]3 years ago
3 0

Answer:

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

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<h3>Answer:</h3>

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<h3>Explanation:</h3>
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Therefore;

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                                      = 20.62 Kj/g

Therefore, a gram of C₂H₅OH  will evolve 20.62 kilo-joules of heat

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