Arkansas State University Department of Chemistry and Physics

1.     H₃PO₄    +    3 KOH    g      K₃PO₄      +    3 H₂O

starting with 20.0 g H₃PO₄  and  30.0 g KOH

1a. KOH is the Limiting reagent

b. 37.85 g K₃PO₄; 9.64 g H₂O

c. 2.55 g H₃PO₄ left

2.   Zn  +  2 HCl     g   ZnCl₂    +   H₂

starting with 10.0 g Zn and 36.46 g HCl

2a. Zn is the Limiting reagent

b. 20.85 g ZnCl₂; 0.31 g H₂

c. 25.52 g HCl left

3.   P₄  +  5 O₂      g   P₄O₁₀

start with 42.0 g P₄ and 16.0 g O₂

3a. O₂is the Limiting Reagent

b. 28.39 g P₄O₁₀

c. 29.61 g P₄ left