Chemistryyyyy (1 Viewer)

[beve]

This eludes me:

What mass of Hydrogen Gas is produced when 1.3g zinc reacts with excess hydrochloric acid? How much zinc chloride is prdouced?

So i have:

Zn + 2HCl > ZnCl2 + 2H

And there are 0.01988 moles of Zinc. (1.3/65.4)

But what do i do next?

:S

 

[Continuum]

This eludes me:

What mass of Hydrogen Gas is produced when 1.3g zinc reacts with excess hydrochloric acid? How much zinc chloride is prdouced?

So i have:

Zn + 2HCl > ZnCl2 + 2H

And there are 0.01988 moles of Zinc. (1.3/65.4)

But what do i do next?

:S

The equation should be H₂, not 2H.

So the equation is: Zn + 2HCl > ZnCl₂ + H₂

Since there are 0.01988 moles of Zn, according to the equation, it will also produce that many moles of ZnCl₂. This is because 1 mole of Zn reacts with excess HCl to produce 1 mole of ZnCl₂ and 1 mole of H₂ - basically the numbers in front of the equation. So if it's only 0.01988 moles of Zn, the reaction can only produce 0.01988 moles of ZnCl₂ and 0.01988 moles moles of H₂.

Now that we found out that 0.01988 moles of H₂ are produced, all we have to find out is the mass. Basically, find the weight of 1 mole of H₂ by adding the weight of two Hs. After that, just go 0.01988/1 and times that by the formula weight of H₂ since you only want to find out the weight of 0.01988 moles, not 1 mole.

 

[beve]

ohh...


simple. cheers.