Q.

The volume of hydrogen liberated at STP by treating 2.4 g of magnesium with excess of hydrochloric acid is _______  x 10-2 L
Given : Molar volume of gas is 22.4 L at STP.
Molar mass of magnesium is 24 g mol-1
 

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answer is 224.

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Detailed Solution

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Mg+2HClMgCl2+H2
24 gm                 22.4 lt
2.4 gms              2.24 lt
2.24lt=224×102lt

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