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Limiting Reactant Practice Problems Quiz

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1. If 2.0 mol of N$_2$ reacts with 6.0 mol of H$_2$ to produce NH$_3$ according to the reaction N$_2$ + 3H$_2$ \(\rightarrow\) 2NH$_3$, which reactant is the limiting reactant?

2. In a reaction that produces water from hydrogen and oxygen, 4.0 moles of H$_2$ are reacted with 2.0 moles of O$_2$. The reaction is 2H$_2$ + O$_2$ \(\rightarrow\) 2H$_2$O. Which reactant is the limiting reactant?

3. A chemist mixes 5.0 grams of sodium (Na) with 5.0 grams of chlorine (Cl$_2$) to produce sodium chloride (NaCl) according to the equation 2Na + Cl$_2$ \(\rightarrow\) 2NaCl. Given the molar masses are approximately 23 g/mol for Na and 71 g/mol for Cl$_2$, which reactant is the limiting reactant?

4. In a laboratory, 0.50 moles of zinc (Zn) reacts with 0.25 moles of sulfur (S) to form zinc sulfide (ZnS) according to the equation Zn + S \(\rightarrow\) ZnS. What is the limiting reactant?

5. A reaction between A and B produces product P according to the equation 2A + 3B \(\rightarrow\) 4P. If you start with 2.0 moles of A and 3.0 moles of B, which reactant is the limiting reactant?

6. The combustion of ethanol (C$_2$H$_5$OH) in oxygen produces carbon dioxide and water according to the equation C$_2$H$_5$OH + 3O$_2$ \(\rightarrow\) 2CO$_2$ + 3H$_2$O. If 1 mole of C$_2$H$_5$OH is burned in the presence of 2 moles of O$_2$, which is the limiting reactant?

7. In the reaction to produce ammonia (NH$_3$) from nitrogen (N$_2$) and hydrogen (H$_2$) according to the equation N$_2$ + 3H$_2$ \(\rightarrow\) 2NH$_3$, if 3.0 moles of N$_2$ and 9.0 moles of H$_2$ are reacted, which reactant is the limiting reactant?

8. When magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas according to the equation Mg + 2HCl \(\rightarrow\) MgCl$_2$ + H$_2$, if 1.0 mole of Mg reacts with 1.0 mole of HCl, what is the limiting reactant?

9. Nitrogen monoxide reacts with oxygen to form nitrogen dioxide according to the equation 2NO + O$_2$ \(\rightarrow\) 2NO$_2$. If 5.0 moles of NO react with 2.5 moles of O$_2$, which reactant is the limiting reactant?

10. If 1.0 mole of copper(II) sulfate (CuSO$_4$) reacts with 2.0 moles of sodium hydroxide (NaOH) to produce copper(II) hydroxide (Cu(OH)$_2$) and sodium sulfate (Na$_2$SO$_4$) according to the equation CuSO$_4$ + 2NaOH \(\rightarrow\) Cu(OH)$_2$ + Na$_2$SO$_4$, which reactant is the limiting reactant?