Problem: When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced.2Al (s) + 6HCl (aq) → 2AlCl3 (aq) + 3H2 (g) What volume in L of H2 (g) is produced when 7.40 g of Al (s) reacts at STP?

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FREE Expert Solution

We will calculate the amount of hydrogen gas (H2(g)) produced by Al(s) using the balanced reaction equation. 

Balanced reaction equation:      2 Al(s) + 6 HCl(aq) → 2 AlCl3(aq) + 3 H2(g)


Since we need to find the volume of H2(g) produced and the temperature and pressure (STP) are given, we’re going to use the ideal gas equation:

STP means Standard Temperature and Pressure where:

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Problem Details

When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced.

2Al (s) + 6HCl (aq) → 2AlCl3 (aq) + 3H2 (g) 

What volume in L of H2 (g) is produced when 7.40 g of Al (s) reacts at STP?


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Our tutors have indicated that to solve this problem you will need to apply the Standard Temperature and Pressure concept. You can view video lessons to learn Standard Temperature and Pressure. Or if you need more Standard Temperature and Pressure practice, you can also practice Standard Temperature and Pressure practice problems.

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Based on our data, we think this problem is relevant for Professor Geiger's class at UCB.