Chemistry - Stoichiometry Question with Solution | TestHub

Explain Question: Find the correct statement.

Concept: Percentage Yield

Solution:

$$2ZnS+3O_2\stackrel{80\%}{\to }2ZnO+2S{O}_2$$

15 moles of ZnS yields $15\times 0.8=12$ moles of ZnO.

$$ZnO+H_{2}S{O}_4\stackrel{75\%}{\to }ZnS{O}_4+H_{2}O$$

12 moles of ZnO yields $12\times 0.75=9$ moles of ZnSO₄.

$$2ZnS{O}_4+2H_{2}O\stackrel{50\%}{\to }2Zn+2H_{2}S{O}_4+O_2$$

From 9 moles of ZnSO₄:

Moles of Zn produced = $9\times 0.5=4.5$ moles

Moles of H₂SO₄ produced = $9\times 0.5=4.5$ moles

Moles of O₂ produced = $4.5\times 0.5=2.25$ moles