If 2.5 moles of zinc react with 6.0 moles of hydrochloric acid react in the equation Zn+2HCl→ZnCl2+H2 , what is the limiting reactant?
A
Zn
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B
HCl
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C
H2
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D
ZnCl
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E
ZnH
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Solution
The correct option is AZn Zn+2HCl→ZnCl2+H2 1 mole of Zn reacts with 2 moles of HCl. 2.5 moles of Zn will react with 2×2.5=5.0 moles of HCl. However 6.0 moles of HCl are present. Thus, HCl is the excess reactant and Zn is the limiting reactant.