Question

How many moles of Hydrogen gas will be produced if you start with 2.5 moles of Magnesium and an excess of Hydrochloric Acid given the following balanced chemical reaction:

Mg + 2HCl → MgCl2 + H2

Group of answer choices

A. 1.25 moles

B. 5.0 Moles

C. 7.5 moles

D. 2.5 moles

Answer 1

Taking into account the reaction stoichiometry, 1.25 grams of H₂ (option A) are formed if you start with 2.5 moles of Magnesium and an excess of Hydrochloric Acid.

Reaction stoichiometry

In first place, the balanced reaction is:

Mg + 2 HCl  → MgCl₂ + H₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

• Mg: 1 mole
• HCl: 2 moles
• MgCl₂: 1 mole
• H₂: 1 mole

Mass of hydrogen formed

The following rule of three can be applied: if by reaction stoichiometry 2 moles of Mg form 1 mole of H₂, 2.5 moles of Mg form how many moles of H₂?

$moles of H_{2} =\frac{2.5 moles of Mgx1 mole of H_{2} }{2 moles of Mg}$

moles of H₂= 1.25 moles

Finally, 1.25 grams of H₂ (option A) are formed if you start with 2.5 moles of Magnesium and an excess of Hydrochloric Acid.

Learn more about the reaction stoichiometry:

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