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Solution: 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?

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?


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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