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Consider the reaction:Mg(s) + 2 HCl(aq) ? MgCl2(aq) +

Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro ISBN: 9780321910295 34

Solution for problem 116P Chapter 13

Introductory Chemistry | 5th Edition

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Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro

Introductory Chemistry | 5th Edition

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Problem 116P

Consider the reaction:

Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g)

What minimum amount of 1.85 M HCl is necessary to produce 28.5 L of H2 at STP?

Step-by-Step Solution:

Solution 116P :

Step 1:

Given reaction:

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

Minimum amount of 1.85 M HCl necessary to produce 28.5 L of H2 at STP = ?

At STP, One mole of an ideal gas will occupy a volume of 22.4 liters.

Therefore, moles of H2 required at STP to produce 28.5 L of H2 = 28.5 L

                                        = 1.272 moles.

Step 2:

In the above reaction, we see 2 moles of HCl produces, 1 mol of H2. Therefore, number of moles required to produce 1.272 moles of H2 is :

                = 1.272 moles of H2

                = 2.544 moles of HCl

Therefore, 2.544 moles of HCl is required to produce 1.272 moles of H2.

Step 3 of 3

Chapter 13, Problem 116P is Solved
Textbook: Introductory Chemistry
Edition: 5
Author: Nivaldo J Tro
ISBN: 9780321910295

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