One of the types of bronze contains 85% copper, 12% tin and 3% zinc. Determine the amount of hydrogen

| February 19, 2021 | education

One of the types of bronze contains 85% copper, 12% tin and 3% zinc. Determine the amount of hydrogen that will be released when dissolving 1 kg of this alloy in an excess of sulfuric acid solution?

Cu and Sn will not react with sulfuric acid.

1. Let’s find the mass of zinc in the alloy.

1000 g – 100%,

X (Zn) – 3%.

X (Zn) = (3% × 1000 g): 100%,

x (Zn) = 30 g.

M (Zn) = 65 g / mol.

2.Let’s find the amount of zinc.

n = 30 g: 65 g / mol = 0.46 mol.

Let’s compose the equation for the reaction between zinc and sulfuric acid. Let’s find the quantitative ratios of substances.

Zn + H2SO4 = ZnSO4 + H2.

According to the reaction equation, there is 1 mole of hydrogen per mole of zinc. Substances react 1: 1.

The amount of substance will be equal.

n (Zn) = n (H2) = 0.46 mol.

V = Vn n, where Vn is the molar volume of gas equal to 22.4 l / mol, and n is the amount of substance.

V = 22.4 L / mol × 0.46 mol = 10.3 L.

Answer: 10.3 liters.



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