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Question

H2+Cl22HCl
If 2.02 g of H2 and 35.45 g of Cl2 are allowed to react, what is the limiting reactant and what mass of HCl will be formed?

A
H2,72.92g
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B
Cl2,36.46g
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C
H2,36.46g
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D
Cl2,18.23g
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Solution

The correct option is B Cl2,36.46g
H2 + Cl22HCl
No. of moles of Hydrogen =2.022.02=1 mole
No. of moles of Oxygen =35.4570.9=0.5 mole
1 mole of H2 react with 1 mole of Chlorine to give 2 moles of HCl. But Chlorine has only 0.5 mole. So only 1 mole of HCl is formed.
Mass of 1 mole of HCl =1.01+35.45=36.469
As, chlorine is completely consumed, Cl2 is limiting reagent.

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