
Concept explainers
Interpretation: The mass percentage of aluminum in the alloy should be found out if 0.3284 g of
Concept introduction:
Iron- aluminum alloys possess a property of getting magnetized in the presence of a magnetic field and to get demagnetized in its absence.
When metals above Hydrogen in the reactivity series are reacted with hydrochloric acid, it will result in the metal chloride with bubbles of hydrogen gas.

Answer to Problem 4.92PAE
Solution:
Percentage of aluminum in alloy = 12.6 %
.
Explanation of Solution
Given information:
Total mass of Alloy = 7.264 g
Total mass of
Aluminum and iron react with HCl as shown below.
Assuming that,
Mass of Aluminum = m g
Mass of Iron = 7.264 - m g
Stoichiometry of,
Al: H2 = 1: 3/2
Fe: H2 = 1: 1
Because of excess HCl, it is assumed that total alloy reacted.
Therefore,
According to given data,
Evolved H2(g) moles = 0.3284 g / 2 gmol-1
Stoichiometric
Mass percentage of a metal in an alloy can be found out when the total mass of alloy and the mass of hydrogen gas released out when the alloy is reacted with hydrochloric acid is known.
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