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If 6.5g of magnesium ribbon reacts completely with Hydrochloric acid, how many grams of hydrogen...

Chemistry
WAEC 2019

If 6.5g of magnesium ribbon reacts completely with Hydrochloric acid, how many grams of hydrogen gas would be liberated?

Mg(s) + 2 HCl(aq) --> MgCl 2(aq) + H 2(g)

[ H = 1.0, Mg = 24.0 ]

  • A. 0.54g
  • B. 0.70g
  • C. 1.08g
  • D. 1.40g
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Correct Answer: Option A
Explanation

  24g of Mg will liberate 2g of H

: 6.5g of Mg will liberate Xg of H

= ( 6.5 X 2 ) / 24

= 0.5416g of Hygrogen ( H )

 

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