how many moles of hydrogen will be evolved when 6.50 g of zinc is dipped in 6.023*10^23 acid at STP is
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Zn +2 HCl ———› ZnCl2 + H2
6.5 g of Zn is 0.1 mole of Zn (A≈65)
So one mole of zinc requires 2 mole of HCL but we only have 0.1 mole of each, Zn will be limiting agent(all of zinc won't react) and 0.1 mole of HCL will react with only 0.1/2 mole of zinc.
One mole of zinc give one mole of hydrogen so 0.1 /2 mole of zinc will give 0.1/2 mole of hydrogen.
Explanation:
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