Zinc reacts with hydrochloric acid in a single replacement reaction. If 2.62 grams of zinc react with 3.65 grams of hydrochloric acid, then how many grams of hydrogen are actually produced if the...

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First, we have to make the balanced chemical equation for this reaction.

`Zn + 2 HCl -> ZnCl_2 + H_2`

Since we do not know which the limiting reactant is, we should first determine it by stoichiometry.

`2.62 grams Zn * (1 mol e Zn)/(65.38 grams Zn) * (1 mol e H_2)/(1 mol e Zn)`

`= 0.04007 mol es H_2`


`3.65 grams HCl * (1 mol e HCl)/(36.46 grams) * (1 mol e H_2)/(2 mol es HCl)`

`= 0.05005 mol es H_2`


Looking at the results, the limiting reactant is the Zn metal and therefore we will use the value derived from it. 

Theoretical amount of H2 gas formed:

`0.04007 mol es H_2 * (2.016 grams H_2)/(1 mol e H_2)`

`= 0.0808 grams of H_2 is p r oduced` -> theoretical yield


Percentage yield:

`percent yield = (actual yield)/(theo retical yield) * 100`

`(percent yield)/100 =(actual yield)/(theo retical yield)`

`actual yield = (93)/(100) *0.0808 grams`

actual yield = 0.0751 grams of H2 were actually produced. 


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