Instead of a strip of pure Mg ribbon, you are accidentally given a strip of an aluminum-magnesium alloy. You calculate the mass of the strip as above. Would the mass of the strip be higher or lower than expected? Write the appropriate chemical equations (one equation for the reaction of Mg with HCl and another equation for the reaction of Al with HCl) and explain your answer.

Question

Instead of a strip of pure Mg ribbon, you are accidentally given a strip of an aluminum-magnesium alloy. You calculate the mass of the strip as above. Would the mass of the strip be higher or lower than expected? Write the appropriate chemical equations (one equation for the reaction of Mg with HCl and another equation for the reaction of Al with HCl) and explain your answer.

Answer 1

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Answer 2

To determine if the mass of the strip would be higher or lower than expected, we need to consider the reactions of magnesium (Mg) and aluminum (Al) with hydrochloric acid (HCl) separately.

When pure magnesium reacts with hydrochloric acid, the following chemical equation represents the reaction:

2HCl + Mg → MgCl2 + H2

From this equation, we can see that two moles of hydrochloric acid react with one mole of magnesium to produce one mole of magnesium chloride and one mole of hydrogen gas.

On the other hand, when aluminum reacts with hydrochloric acid, the chemical equation for the reaction is as follows:

6HCl + 2Al → 2AlCl3 + 3H2

Here, six moles of hydrochloric acid react with two moles of aluminum to produce two moles of aluminum chloride and three moles of hydrogen gas.

Now, let's consider the scenario where an aluminum-magnesium alloy is used instead of pure magnesium. The presence of aluminum in the alloy will also react with hydrochloric acid, which means there are effectively two reactions happening at the same time: the reaction of magnesium and the reaction of aluminum.

So, the total mass of the strip would be higher than expected because both magnesium and aluminum in the alloy will react with hydrochloric acid, leading to the production of additional products (magnesium chloride and aluminum chloride) and more moles of hydrogen gas compared to the reaction of pure magnesium alone.

To determine the exact change in mass, you need to know the ratio of aluminum to magnesium in the alloy and the relative masses of aluminum and magnesium. By knowing the composition of the alloy and the masses of aluminum and magnesium, you can calculate the expected mass change accordingly.