Question

14. How many moles of hydrogen will be evolved when 6.50 g of zinc (Atomio
weight = 65) is dipped in 6.023 x 102 molecules of hydrochloric acid at STP
(Zn + 2HCl → ZnCl, +H,) (AS)
A) 2 moles
B) 1 mole
C) 0.75 mole
D) 0.05 mole

Answer 1

Answer:

Explanation:

65g Zn reacts with 2x6.023x10^23 molecules of HCl

Hence , 6.50g Zn requires 2x6.023x10^22 molecules of HCl to react completely .

But we have used only 6.023x10^22 molecules of HCl. Hence , you can see that molecules of HCl are less than required for 6.5g Zn to react completely . So , the reaction will occur only until HCl is present .

So , now ,from above reaction ,

When 2*6 023*10^23 HCl is consumed , 1 mole of H2 is produced .

Hence , when 6.023*10^22 HCl is consumed , 0.05 mole of H2 will be produced .

Hope it will help u

Ans: 0.05 mole

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