# 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?

###### FREE Expert Solution
86% (361 ratings)
###### 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:

86% (361 ratings) ###### 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?

What scientific concept do you need to know in order to solve this problem?

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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Our tutors rated the difficulty ofWhen aluminum is placed in concentrated hydrochloric acid, h...as medium difficulty.

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Our expert Chemistry tutor, Dasha took 4 minutes and 43 seconds to solve this problem. You can follow their steps in the video explanation above.

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