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A gas is formed in the reaction shown below. The gas laws can help determine the volume of gas produced.

Zn(s) + 2 HCl(aq) → ZnCl₂ + H₂(g)

Assume that 130.8 grams of Zn was used in this reaction. To determine the number of moles of hydrogen gas formed, you need to know the number of moles of Zn reactant was used. What quantity in moles of Zn were used?

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CintiaSalazar

Considering the definition of molar mass, the number of moles of Zn reactant used is 2 moles.

Definition of molar mass

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

Number of moles of Zn used

The balanced reaction is:

Zn(s) + 2 HCl(aq) → ZnCl₂ + H₂(g)

Assume that 130.8 grams of Zn was used in this reaction.

To determine the number of moles of hydrogen gas formed, you need to know the number of moles of Zn reactant was used.

So to determine the number of moles used you know that the molar mass of Zn is 65.37[tex]\frac{g}{moles}[/tex]. Then:

[tex]molar mass=\frac{mass}{number of moles}[/tex]

[tex]65.37\frac{g}{moles} =\frac{130.8 g}{number of moles}[/tex]

Solving:

number of moles× 65.37[tex]\frac{g}{moles}[/tex]= 130.8 g

[tex]number of moles=\frac{130.8 g}{65.37\frac{g}{moles}}[/tex]

number of moles≅ 2 moles

Finally, the number of moles of Zn reactant used is 2 moles.

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