Question

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STOICHIOMETRY CALCULATIONS
This portion of the test includes a mass-mass stoichiometry problem. To earn full credit, you must show all the calculations used to solve the problem.

Show all your calculation work to solve the following mass-mass stoichiometry problem:

How many grams of zinc (II) chloride (ZnCl2) are produced if 6.5 grams of zinc (Zn) are used in a chemical reaction according to the following equation?

Zn(s) + 2HCl(aq) ⟶ ZnCl2(aq) + H2(g)

Answer 1

Answer:

14g ZnCl₂

Explanation:

We can convert grams of reactant to grams of product by converting to moles, and using the stoichiometric ratios in the reaction equation:

$\dfrac{6.5g\text{ Zn}}{1} \times \dfrac{1\text{ mole Zn}}{65.38g\text{ Zn}}\times \dfrac{1\text{ mole ZnCl}_2}{1\text{ mole Zn}} \times \dfrac{(65.38+2(35.45))g\text{ ZnCl}_2}{1\text{ mole ZnCl}_2}$

$\approx 13.549g\text{ ZnCl}_2$

$\approx 14g\text{ ZnCl}_2$   ... rounded to 2 significant figures